31020649 has 6 divisors (see below), whose sum is σ = 34097210. Its totient is φ = 28200480.

The previous prime is 31020623. The next prime is 31020653. The reversal of 31020649 is 94602013.

It can be written as a sum of positive squares in only one way, i.e., 28815424 + 2205225 = 5368^2 + 1485^2 .

It is not a de Polignac number, because 31020649 - 2⁵ = 31020617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31020659) 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, 128064 + ... + 128305.

Almost surely, 2^31020649 is an apocalyptic number.

It is an amenable number.

31020649 is a deficient number, since it is larger than the sum of its proper divisors (3076561).

31020649 is a wasteful number, since it uses less digits than its factorization.

31020649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256391 (or 256380 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 31020649 is about 5569.6183890820. The cubic root of 31020649 is about 314.2077985424.

The spelling of 31020649 in words is "thirty-one million, twenty thousand, six hundred forty-nine".