31321425 has 24 divisors (see below), whose sum is σ = 53189056. Its totient is φ = 16251840.

The previous prime is 31321399. The next prime is 31321427. The reversal of 31321425 is 52412313.

It is not a de Polignac number, because 31321425 - 2¹⁵ = 31288657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31321427) 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, 2869 + ... + 8418.

Almost surely, 2^31321425 is an apocalyptic number.

It is an amenable number.

31321425 is a deficient number, since it is larger than the sum of its proper divisors (21867631).

31321425 is a wasteful number, since it uses less digits than its factorization.

31321425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11337 (or 11332 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 31321425 is about 5596.5547437687. The cubic root of 31321425 is about 315.2200528408.

Adding to 31321425 its reverse (52412313), we get a palindrome (83733738).

The spelling of 31321425 in words is "thirty-one million, three hundred twenty-one thousand, four hundred twenty-five".