831745075981 has 16 divisors (see below), whose sum is σ = 864483701760. Its totient is φ = 799278641280.

The previous prime is 831745075933. The next prime is 831745075999. The reversal of 831745075981 is 189570547138.

It is a cyclic number.

It is not a de Polignac number, because 831745075981 - 2¹¹ = 831745073933 is a prime.

It is a super-2 number, since 2×831745075981² (a number of 25 digits) 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 (831745075081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34088296 + ... + 34112686.

It is an arithmetic number, because the mean of its divisors is an integer number (54030231360).

Almost surely, 2^831745075981 is an apocalyptic number.

It is an amenable number.

831745075981 is a deficient number, since it is larger than the sum of its proper divisors (32738625779).

831745075981 is a wasteful number, since it uses less digits than its factorization.

831745075981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29916.

The product of its (nonzero) digits is 8467200, while the sum is 58.

The spelling of 831745075981 in words is "eight hundred thirty-one billion, seven hundred forty-five million, seventy-five thousand, nine hundred eighty-one".