31280425 has 24 divisors (see below), whose sum is σ = 44809632. Its totient is φ = 21408000.

The previous prime is 31280423. The next prime is 31280449. The reversal of 31280425 is 52408213.

It is not a de Polignac number, because 31280425 - 2¹ = 31280423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31280425.

It is not an unprimeable number, because it can be changed into a prime (31280423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1330 + ... + 8020.

It is an arithmetic number, because the mean of its divisors is an integer number (1867068).

Almost surely, 2^31280425 is an apocalyptic number.

It is an amenable number.

31280425 is a deficient number, since it is larger than the sum of its proper divisors (13529207).

31280425 is a wasteful number, since it uses less digits than its factorization.

31280425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6729 (or 6724 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 31280425 is about 5592.8905764372. The cubic root of 31280425 is about 315.0824509119.

Adding to 31280425 its reverse (52408213), we get a palindrome (83688638).

The spelling of 31280425 in words is "thirty-one million, two hundred eighty thousand, four hundred twenty-five".