880891631 has 4 divisors (see below), whose sum is σ = 881762232. Its totient is φ = 880021032.

The previous prime is 880891603. The next prime is 880891643. The reversal of 880891631 is 136198088.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-880891631 is a prime.

It is a super-2 number, since 2×880891631² = 1551940131131680322, 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 (880891681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 433781 + ... + 435806.

It is an arithmetic number, because the mean of its divisors is an integer number (220440558).

Almost surely, 2^880891631 is an apocalyptic number.

880891631 is a deficient number, since it is larger than the sum of its proper divisors (870601).

880891631 is a wasteful number, since it uses less digits than its factorization.

880891631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870600.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 880891631 is about 29679.8185809819. The cubic root of 880891631 is about 958.6075120496.

The spelling of 880891631 in words is "eight hundred eighty million, eight hundred ninety-one thousand, six hundred thirty-one".