31129425 has 36 divisors (see below), whose sum is σ = 57567744. Its totient is φ = 16063200.

The previous prime is 31129411. The next prime is 31129433. The reversal of 31129425 is 52492113.

It is not a de Polignac number, because 31129425 - 2⁴ = 31129409 is a prime.

It is a super-2 number, since 2×31129425² = 1938082201661250, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4744 + ... + 9206.

It is an arithmetic number, because the mean of its divisors is an integer number (1599104).

Almost surely, 2^31129425 is an apocalyptic number.

It is an amenable number.

31129425 is a deficient number, since it is larger than the sum of its proper divisors (26438319).

31129425 is a wasteful number, since it uses less digits than its factorization.

31129425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510 (or 4502 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 31129425 is about 5579.3749649938. The cubic root of 31129425 is about 314.5746337180.

The spelling of 31129425 in words is "thirty-one million, one hundred twenty-nine thousand, four hundred twenty-five".