31393449 has 6 divisors (see below), whose sum is σ = 45346106. Its totient is φ = 20928960.

The previous prime is 31393447. The next prime is 31393471. The reversal of 31393449 is 94439313.

It can be written as a sum of positive squares in only one way, i.e., 31136400 + 257049 = 5580^2 + 507^2 .

It is not a de Polignac number, because 31393449 - 2¹ = 31393447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31393447) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1744072 + ... + 1744089.

Almost surely, 2^31393449 is an apocalyptic number.

It is an amenable number.

31393449 is a deficient number, since it is larger than the sum of its proper divisors (13952657).

31393449 is a wasteful number, since it uses less digits than its factorization.

31393449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3488167 (or 3488164 counting only the distinct ones).

The product of its digits is 34992, while the sum is 36.

The square root of 31393449 is about 5602.9857219165. The cubic root of 31393449 is about 315.4614853323.

The spelling of 31393449 in words is "thirty-one million, three hundred ninety-three thousand, four hundred forty-nine".