31001397 has 16 divisors (see below), whose sum is σ = 47491200. Its totient is φ = 17620992.

The previous prime is 31001393. The next prime is 31001419. The reversal of 31001397 is 79310013.

It is not a de Polignac number, because 31001397 - 2² = 31001393 is a prime.

It is a super-2 number, since 2×31001397² = 1922173231903218, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31001393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229 + ... + 7877.

It is an arithmetic number, because the mean of its divisors is an integer number (2968200).

Almost surely, 2^31001397 is an apocalyptic number.

It is an amenable number.

31001397 is a deficient number, since it is larger than the sum of its proper divisors (16489803).

31001397 is a wasteful number, since it uses less digits than its factorization.

31001397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7852.

The product of its (nonzero) digits is 567, while the sum is 24.

The square root of 31001397 is about 5567.8898157201. The cubic root of 31001397 is about 314.1427839949.

The spelling of 31001397 in words is "thirty-one million, one thousand, three hundred ninety-seven".