31265421 has 16 divisors (see below), whose sum is σ = 45721920. Its totient is φ = 18846720.

The previous prime is 31265417. The next prime is 31265449. The reversal of 31265421 is 12456213.

It is not a de Polignac number, because 31265421 - 2² = 31265417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31265391 and 31265400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31265401) 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 15 ways as a sum of consecutive naturals, for example, 3915 + ... + 8823.

It is an arithmetic number, because the mean of its divisors is an integer number (2857620).

Almost surely, 2^31265421 is an apocalyptic number.

It is an amenable number.

31265421 is a deficient number, since it is larger than the sum of its proper divisors (14456499).

31265421 is a wasteful number, since it uses less digits than its factorization.

31265421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5116.

The product of its digits is 1440, while the sum is 24.

The square root of 31265421 is about 5591.5490698017. The cubic root of 31265421 is about 315.0320652669.

The spelling of 31265421 in words is "thirty-one million, two hundred sixty-five thousand, four hundred twenty-one".