31278425 has 12 divisors (see below), whose sum is σ = 38854656. Its totient is φ = 24978000.

The previous prime is 31278409. The next prime is 31278433. The reversal of 31278425 is 52487213.

It is not a de Polignac number, because 31278425 - 2⁴ = 31278409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31278391 and 31278400.

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, 26600 + ... + 27750.

It is an arithmetic number, because the mean of its divisors is an integer number (3237888).

Almost surely, 2^31278425 is an apocalyptic number.

It is an amenable number.

31278425 is a deficient number, since it is larger than the sum of its proper divisors (7576231).

31278425 is a wasteful number, since it uses less digits than its factorization.

31278425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2248 (or 2243 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 31278425 is about 5592.7117751588. The cubic root of 31278425 is about 315.0757355477.

The spelling of 31278425 in words is "thirty-one million, two hundred seventy-eight thousand, four hundred twenty-five".