31561713 has 12 divisors (see below), whose sum is σ = 46008820. Its totient is φ = 20847456.

The previous prime is 31561711. The next prime is 31561723. The reversal of 31561713 is 31716513.

31561713 is a `hidden beast` number, since 31 + 5 + 617 + 13 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17363889 + 14197824 = 4167^2 + 3768^2 .

It is not a de Polignac number, because 31561713 - 2¹ = 31561711 is a prime.

It is a super-2 number, since 2×31561713² = 1992283454988738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31561711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15106 + ... + 17067.

Almost surely, 2^31561713 is an apocalyptic number.

It is an amenable number.

31561713 is a deficient number, since it is larger than the sum of its proper divisors (14447107).

31561713 is a wasteful number, since it uses less digits than its factorization.

31561713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32288 (or 32285 counting only the distinct ones).

The product of its digits is 1890, while the sum is 27.

The square root of 31561713 is about 5617.9812210437. The cubic root of 31561713 is about 316.0240895218.

The spelling of 31561713 in words is "thirty-one million, five hundred sixty-one thousand, seven hundred thirteen".