31275997 has 4 divisors (see below), whose sum is σ = 31716576. Its totient is φ = 30835420.

The previous prime is 31275967. The next prime is 31276013. The reversal of 31275997 is 79957213.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31275997 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 (31275967) 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, 220183 + ... + 220324.

It is an arithmetic number, because the mean of its divisors is an integer number (7929144).

Almost surely, 2^31275997 is an apocalyptic number.

It is an amenable number.

31275997 is a deficient number, since it is larger than the sum of its proper divisors (440579).

31275997 is an equidigital number, since it uses as much as digits as its factorization.

31275997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440578.

The product of its digits is 119070, while the sum is 43.

The square root of 31275997 is about 5592.4947027244. The cubic root of 31275997 is about 315.0675827109.

The spelling of 31275997 in words is "thirty-one million, two hundred seventy-five thousand, nine hundred ninety-seven".