981007381 has 4 divisors (see below), whose sum is σ = 1007521132. Its totient is φ = 954493632.

The previous prime is 981007333. The next prime is 981007387. The reversal of 981007381 is 183700189.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 183700189 = 19 ⋅9668431.

It can be written as a sum of positive squares in 2 ways, for example, as 514836100 + 466171281 = 22690^2 + 21591^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981007381 is a prime.

It is a super-2 number, since 2×981007381² = 1924750963152958322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 26513713 = 981007381 / (9 + 8 + 1 + 0 + 0 + 7 + 3 + 8 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 981007381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981007387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13256820 + ... + 13256893.

It is an arithmetic number, because the mean of its divisors is an integer number (251880283).

Almost surely, 2^981007381 is an apocalyptic number.

It is an amenable number.

981007381 is a deficient number, since it is larger than the sum of its proper divisors (26513751).

981007381 is a wasteful number, since it uses less digits than its factorization.

981007381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26513750.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 981007381 is about 31321.0373551069. The cubic root of 981007381 is about 993.6286187149.

The spelling of 981007381 in words is "nine hundred eighty-one million, seven thousand, three hundred eighty-one".