831157760463281 has 4 divisors (see below), whose sum is σ = 838783061018100. Its totient is φ = 823532459908464.

The previous prime is 831157760463263. The next prime is 831157760463287. The reversal of 831157760463281 is 182364067751138.

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

It can be written as a sum of positive squares in 2 ways, for example, as 548780521384225 + 282377239079056 = 23426065^2 + 16804084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-831157760463281 is a prime.

It is a super-2 number, since 2×831157760463281² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (831157760463287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3812650277246 + ... + 3812650277463.

It is an arithmetic number, because the mean of its divisors is an integer number (209695765254525).

Almost surely, 2^{831157760463281} is an apocalyptic number.

It is an amenable number.

831157760463281 is a deficient number, since it is larger than the sum of its proper divisors (7625300554819).

831157760463281 is a wasteful number, since it uses less digits than its factorization.

831157760463281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7625300554818.

The product of its (nonzero) digits is 40642560, while the sum is 62.

The spelling of 831157760463281 in words is "eight hundred thirty-one trillion, one hundred fifty-seven billion, seven hundred sixty million, four hundred sixty-three thousand, two hundred eighty-one".