31157461 has 4 divisors (see below), whose sum is σ = 31168800. Its totient is φ = 31146124.

The previous prime is 31157431. The next prime is 31157471. The reversal of 31157461 is 16475113.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31157461 - 2⁵ = 31157429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31157411) 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, 1350 + ... + 8008.

It is an arithmetic number, because the mean of its divisors is an integer number (7792200).

Almost surely, 2^31157461 is an apocalyptic number.

It is an amenable number.

31157461 is a deficient number, since it is larger than the sum of its proper divisors (11339).

31157461 is an equidigital number, since it uses as much as digits as its factorization.

31157461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11338.

The product of its digits is 2520, while the sum is 28.

The square root of 31157461 is about 5581.8868673595. The cubic root of 31157461 is about 314.6690435150.

The spelling of 31157461 in words is "thirty-one million, one hundred fifty-seven thousand, four hundred sixty-one".