31461157 has 8 divisors (see below), whose sum is σ = 38721536. Its totient is φ = 24892272.

The previous prime is 31461149. The next prime is 31461161. The reversal of 31461157 is 75116413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31461157 - 2³ = 31461149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31461127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172773 + ... + 172954.

It is an arithmetic number, because the mean of its divisors is an integer number (4840192).

Almost surely, 2^31461157 is an apocalyptic number.

It is an amenable number.

31461157 is a deficient number, since it is larger than the sum of its proper divisors (7260379).

31461157 is a wasteful number, since it uses less digits than its factorization.

31461157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345747.

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

The square root of 31461157 is about 5609.0246032621. The cubic root of 31461157 is about 315.6881136016.

The spelling of 31461157 in words is "thirty-one million, four hundred sixty-one thousand, one hundred fifty-seven".