31271157 has 16 divisors (see below), whose sum is σ = 47823360. Its totient is φ = 20174400.

The previous prime is 31271147. The next prime is 31271161. The reversal of 31271157 is 75117213.

It is a happy number.

It is not a de Polignac number, because 31271157 - 2⁷ = 31271029 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 31271157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31271137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17844 + ... + 19517.

It is an arithmetic number, because the mean of its divisors is an integer number (2988960).

Almost surely, 2^31271157 is an apocalyptic number.

It is an amenable number.

31271157 is a deficient number, since it is larger than the sum of its proper divisors (16552203).

31271157 is a wasteful number, since it uses less digits than its factorization.

31271157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37401 (or 37395 counting only the distinct ones).

The product of its digits is 1470, while the sum is 27.

The square root of 31271157 is about 5592.0619631760. The cubic root of 31271157 is about 315.0513295038.

The spelling of 31271157 in words is "thirty-one million, two hundred seventy-one thousand, one hundred fifty-seven".