31921029 has 12 divisors (see below), whose sum is σ = 52695136. Its totient is φ = 18240552.

The previous prime is 31921027. The next prime is 31921067. The reversal of 31921029 is 92012913.

It is not a de Polignac number, because 31921029 - 2¹ = 31921027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31920993 and 31921011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31921027) 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 11 ways as a sum of consecutive naturals, for example, 253279 + ... + 253404.

Almost surely, 2^31921029 is an apocalyptic number.

It is an amenable number.

31921029 is a deficient number, since it is larger than the sum of its proper divisors (20774107).

31921029 is a wasteful number, since it uses less digits than its factorization.

31921029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506696 (or 506693 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 31921029 is about 5649.8698215092. The cubic root of 31921029 is about 317.2188314104.

The spelling of 31921029 in words is "thirty-one million, nine hundred twenty-one thousand, twenty-nine".