31025421 has 12 divisors (see below), whose sum is σ = 51216672. Its totient is φ = 17728776.

The previous prime is 31025419. The next prime is 31025429. The reversal of 31025421 is 12452013.

It is not a de Polignac number, because 31025421 - 2¹ = 31025419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31025394 and 31025403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31025429) 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, 246171 + ... + 246296.

It is an arithmetic number, because the mean of its divisors is an integer number (4268056).

Almost surely, 2^31025421 is an apocalyptic number.

It is an amenable number.

31025421 is a deficient number, since it is larger than the sum of its proper divisors (20191251).

31025421 is a wasteful number, since it uses less digits than its factorization.

31025421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492480 (or 492477 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 31025421 is about 5570.0467682058. The cubic root of 31025421 is about 314.2239095607.

Adding to 31025421 its reverse (12452013), we get a palindrome (43477434).

The spelling of 31025421 in words is "thirty-one million, twenty-five thousand, four hundred twenty-one".