31172497 has 2 divisors, whose sum is σ = 31172498. Its totient is φ = 31172496.

The previous prime is 31172489. The next prime is 31172551. The reversal of 31172497 is 79427113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29986576 + 1185921 = 5476^2 + 1089^2 .

It is an emirp because it is prime and its reverse (79427113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31172497 - 2³ = 31172489 is a prime.

It is not a weakly prime, because it can be changed into another prime (31172437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15586248 + 15586249.

It is an arithmetic number, because the mean of its divisors is an integer number (15586249).

Almost surely, 2^31172497 is an apocalyptic number.

It is an amenable number.

31172497 is a deficient number, since it is larger than the sum of its proper divisors (1).

31172497 is an equidigital number, since it uses as much as digits as its factorization.

31172497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 34.

The square root of 31172497 is about 5583.2335612976. The cubic root of 31172497 is about 314.7196531464.

The spelling of 31172497 in words is "thirty-one million, one hundred seventy-two thousand, four hundred ninety-seven".