31421525 has 18 divisors (see below), whose sum is σ = 41398950. Its totient is φ = 23653120.

The previous prime is 31421479. The next prime is 31421557. The reversal of 31421525 is 52512413.

It can be written as a sum of positive squares in 9 ways, for example, as 8773444 + 22648081 = 2962^2 + 4759^2 .

It is not a de Polignac number, because 31421525 - 2⁶ = 31421461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31421525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5051 + ... + 9399.

Almost surely, 2^31421525 is an apocalyptic number.

It is an amenable number.

31421525 is a deficient number, since it is larger than the sum of its proper divisors (9977425).

31421525 is a wasteful number, since it uses less digits than its factorization.

31421525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4393 (or 4371 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 31421525 is about 5605.4906118912. The cubic root of 31421525 is about 315.5554991890. Note that the first 3 decimals are identical.

Adding to 31421525 its reverse (52512413), we get a palindrome (83933938).

The spelling of 31421525 in words is "thirty-one million, four hundred twenty-one thousand, five hundred twenty-five".