31228929 has 8 divisors (see below), whose sum is σ = 46265120. Its totient is φ = 20819268.

The previous prime is 31228909. The next prime is 31228931. The reversal of 31228929 is 92982213.

It is not a de Polignac number, because 31228929 - 2⁷ = 31228801 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31228893 and 31228902.

It is not an unprimeable number, because it can be changed into a prime (31228909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 578287 + ... + 578340.

It is an arithmetic number, because the mean of its divisors is an integer number (5783140).

Almost surely, 2^31228929 is an apocalyptic number.

It is an amenable number.

31228929 is a deficient number, since it is larger than the sum of its proper divisors (15036191).

31228929 is a wasteful number, since it uses less digits than its factorization.

31228929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156636 (or 1156630 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 31228929 is about 5588.2849784169. The cubic root of 31228929 is about 314.9094524324.

It can be divided in two parts, 312 and 28929, that added together give a square (29241 = 171²).

The spelling of 31228929 in words is "thirty-one million, two hundred twenty-eight thousand, nine hundred twenty-nine".