31405425 has 12 divisors (see below), whose sum is σ = 51923760. Its totient is φ = 16749520.

The previous prime is 31405411. The next prime is 31405441. The reversal of 31405425 is 52450413.

It is not a de Polignac number, because 31405425 - 2²³ = 23016817 is a prime.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 31405395 and 31405404.

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, 209295 + ... + 209444.

It is an arithmetic number, because the mean of its divisors is an integer number (4326980).

Almost surely, 2^31405425 is an apocalyptic number.

It is an amenable number.

31405425 is a deficient number, since it is larger than the sum of its proper divisors (20518335).

31405425 is a wasteful number, since it uses less digits than its factorization.

31405425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418752 (or 418747 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 31405425 is about 5604.0543359250. The cubic root of 31405425 is about 315.5015944056.

Adding to 31405425 its reverse (52450413), we get a palindrome (83855838).

The spelling of 31405425 in words is "thirty-one million, four hundred five thousand, four hundred twenty-five".