31320425 has 6 divisors (see below), whose sum is σ = 38837358. Its totient is φ = 25056320.

The previous prime is 31320413. The next prime is 31320451. The reversal of 31320425 is 52402313.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 7778521 + 23541904 = 2789^2 + 4852^2 .

It is not a de Polignac number, because 31320425 - 2¹⁶ = 31254889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31320397 and 31320406.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 626384 + ... + 626433.

It is an arithmetic number, because the mean of its divisors is an integer number (6472893).

Almost surely, 2^31320425 is an apocalyptic number.

It is an amenable number.

31320425 is a deficient number, since it is larger than the sum of its proper divisors (7516933).

31320425 is a wasteful number, since it uses less digits than its factorization.

31320425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252827 (or 1252822 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 31320425 is about 5596.4654023768. The cubic root of 31320425 is about 315.2166981253.

Adding to 31320425 its reverse (52402313), we get a palindrome (83722738).

The spelling of 31320425 in words is "thirty-one million, three hundred twenty thousand, four hundred twenty-five".