31261057 has 4 divisors (see below), whose sum is σ = 31343920. Its totient is φ = 31178196.

The previous prime is 31261039. The next prime is 31261067. The reversal of 31261057 is 75016213.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75016213 = 4217 ⋅17789.

It is a cyclic number.

It is not a de Polignac number, because 31261057 - 2²³ = 22872449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31261007) 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, 40863 + ... + 41620.

It is an arithmetic number, because the mean of its divisors is an integer number (7835980).

Almost surely, 2^31261057 is an apocalyptic number.

It is an amenable number.

31261057 is a deficient number, since it is larger than the sum of its proper divisors (82863).

31261057 is an equidigital number, since it uses as much as digits as its factorization.

31261057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82862.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 31261057 is about 5591.1588244299. The cubic root of 31261057 is about 315.0174072853.

The spelling of 31261057 in words is "thirty-one million, two hundred sixty-one thousand, fifty-seven".