869991381 has 32 divisors (see below), whose sum is σ = 1479507200. Its totient is φ = 494942400.

The previous prime is 869991359. The next prime is 869991383. The reversal of 869991381 is 183199968.

It is not a de Polignac number, because 869991381 - 2⁵ = 869991349 is a prime.

It is a super-2 number, since 2×869991381² = 1513770006028574322, 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 (869991383) 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 31 ways as a sum of consecutive naturals, for example, 33231 + ... + 53331.

It is an arithmetic number, because the mean of its divisors is an integer number (46234600).

Almost surely, 2^869991381 is an apocalyptic number.

It is an amenable number.

869991381 is a deficient number, since it is larger than the sum of its proper divisors (609515819).

869991381 is a wasteful number, since it uses less digits than its factorization.

869991381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20346 (or 20340 counting only the distinct ones).

The product of its digits is 839808, while the sum is 54.

The square root of 869991381 is about 29495.6163014099. The cubic root of 869991381 is about 954.6371184181.

The spelling of 869991381 in words is "eight hundred sixty-nine million, nine hundred ninety-one thousand, three hundred eighty-one".