381319381 has 4 divisors (see below), whose sum is σ = 382803372. Its totient is φ = 379835392.

The previous prime is 381319363. The next prime is 381319403. The reversal of 381319381 is 183913183.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 183467025 + 197852356 = 13545^2 + 14066^2 .

It is a cyclic number.

It is not a de Polignac number, because 381319381 - 2¹¹ = 381317333 is a prime.

It is a super-2 number, since 2×381319381² = 290808940652446322, which contains 22 as substring.

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 381319381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381319331) 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, 741610 + ... + 742123.

It is an arithmetic number, because the mean of its divisors is an integer number (95700843).

Almost surely, 2^381319381 is an apocalyptic number.

It is an amenable number.

381319381 is a deficient number, since it is larger than the sum of its proper divisors (1483991).

381319381 is a wasteful number, since it uses less digits than its factorization.

381319381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483990.

The product of its digits is 15552, while the sum is 37.

The square root of 381319381 is about 19527.4007742966. The cubic root of 381319381 is about 725.1529639989.

The spelling of 381319381 in words is "three hundred eighty-one million, three hundred nineteen thousand, three hundred eighty-one".