1381792981 has 4 divisors (see below), whose sum is σ = 1386509292. Its totient is φ = 1377076672.

The previous prime is 1381792961. The next prime is 1381792987. The reversal of 1381792981 is 1892971831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1892971831 = 11831 ⋅160001.

It can be written as a sum of positive squares in 2 ways, for example, as 1001152881 + 380640100 = 31641^2 + 19510^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381792981 - 2⁵ = 1381792949 is a prime.

It is a super-2 number, since 2×1381792981² = 3818703684681732722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381792987) 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, 2357716 + ... + 2358301.

It is an arithmetic number, because the mean of its divisors is an integer number (346627323).

Almost surely, 2^1381792981 is an apocalyptic number.

It is an amenable number.

1381792981 is a deficient number, since it is larger than the sum of its proper divisors (4716311).

1381792981 is an equidigital number, since it uses as much as digits as its factorization.

1381792981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4716310.

The product of its digits is 217728, while the sum is 49.

The square root of 1381792981 is about 37172.4761214531. The cubic root of 1381792981 is about 1113.8182445398.

The spelling of 1381792981 in words is "one billion, three hundred eighty-one million, seven hundred ninety-two thousand, nine hundred eighty-one".