31320025 has 12 divisors (see below), whose sum is σ = 42367824. Its totient is φ = 22778000.

The previous prime is 31320011. The next prime is 31320041. The reversal of 31320025 is 52002313.

It is not a de Polignac number, because 31320025 - 2⁹ = 31319513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31319990 and 31320008.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56671 + ... + 57220.

It is an arithmetic number, because the mean of its divisors is an integer number (3530652).

Almost surely, 2^31320025 is an apocalyptic number.

It is an amenable number.

31320025 is a deficient number, since it is larger than the sum of its proper divisors (11047799).

31320025 is a wasteful number, since it uses less digits than its factorization.

31320025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113912 (or 113907 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 31320025 is about 5596.4296654206. The cubic root of 31320025 is about 315.2153562191.

Adding to 31320025 its reverse (52002313), we get a palindrome (83322338).

The spelling of 31320025 in words is "thirty-one million, three hundred twenty thousand, twenty-five".