831131261 has 4 divisors (see below), whose sum is σ = 835308000. Its totient is φ = 826954524.

The previous prime is 831131251. The next prime is 831131263. The reversal of 831131261 is 162131138.

831131261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 831131261 - 2²⁶ = 764022397 is a prime.

It is a super-2 number, since 2×831131261² = 1381558346022900242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 831131261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (831131263) 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, 2088071 + ... + 2088468.

It is an arithmetic number, because the mean of its divisors is an integer number (208827000).

Almost surely, 2^831131261 is an apocalyptic number.

It is an amenable number.

831131261 is a deficient number, since it is larger than the sum of its proper divisors (4176739).

831131261 is a wasteful number, since it uses less digits than its factorization.

831131261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4176738.

The product of its digits is 864, while the sum is 26.

The square root of 831131261 is about 28829.3472177224. The cubic root of 831131261 is about 940.2064059339.

Adding to 831131261 its reverse (162131138), we get a palindrome (993262399).

The spelling of 831131261 in words is "eight hundred thirty-one million, one hundred thirty-one thousand, two hundred sixty-one".