831772881 has 40 divisors (see below), whose sum is σ = 1281221568. Its totient is φ = 537516000.

The previous prime is 831772871. The next prime is 831772883. The reversal of 831772881 is 188277138.

831772881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 831772881 - 2⁵ = 831772849 is a prime.

It is a super-2 number, since 2×831772881² = 1383692251134080322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (831772883) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 349626 + ... + 351996.

Almost surely, 2^831772881 is an apocalyptic number.

831772881 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

831772881 is a deficient number, since it is larger than the sum of its proper divisors (449448687).

831772881 is a wasteful number, since it uses less digits than its factorization.

831772881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2515 (or 2506 counting only the distinct ones).

The product of its digits is 150528, while the sum is 45.

The square root of 831772881 is about 28840.4729676890. The cubic root of 831772881 is about 940.4482851230.

The spelling of 831772881 in words is "eight hundred thirty-one million, seven hundred seventy-two thousand, eight hundred eighty-one".