31931029 has 6 divisors (see below), whose sum is σ = 34576386. Its totient is φ = 29474640.

The previous prime is 31931027. The next prime is 31931033. The reversal of 31931029 is 92013913.

It can be written as a sum of positive squares in 3 ways, for example, as 1703025 + 30228004 = 1305^2 + 5498^2 .

It is not a de Polignac number, because 31931029 - 2¹ = 31931027 is a prime.

It is a super-2 number, since 2×31931029² = 2039181225997682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31930988 and 31931006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31931027) 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, 94302 + ... + 94639.

It is an arithmetic number, because the mean of its divisors is an integer number (5762731).

Almost surely, 2^31931029 is an apocalyptic number.

It is an amenable number.

31931029 is a deficient number, since it is larger than the sum of its proper divisors (2645357).

31931029 is a wasteful number, since it uses less digits than its factorization.

31931029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188967 (or 188954 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 31931029 is about 5650.7547283527. The cubic root of 31931029 is about 317.2519533285.

The spelling of 31931029 in words is "thirty-one million, nine hundred thirty-one thousand, twenty-nine".