31961025 has 18 divisors (see below), whose sum is σ = 57246150. Its totient is φ = 17045760.

The previous prime is 31961023. The next prime is 31961047. The reversal of 31961025 is 52016913.

It can be written as a sum of positive squares in 3 ways, for example, as 589824 + 31371201 = 768^2 + 5601^2 .

It is not a de Polignac number, because 31961025 - 2¹ = 31961023 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31961025.

It is not an unprimeable number, because it can be changed into a prime (31961023) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 70800 + ... + 71249.

Almost surely, 2^31961025 is an apocalyptic number.

It is an amenable number.

31961025 is a deficient number, since it is larger than the sum of its proper divisors (25285125).

31961025 is a wasteful number, since it uses less digits than its factorization.

31961025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142065 (or 142057 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 31961025 is about 5653.4082640474. The cubic root of 31961025 is about 317.3512643704.

Adding to 31961025 its reverse (52016913), we get a palindrome (83977938).

The spelling of 31961025 in words is "thirty-one million, nine hundred sixty-one thousand, twenty-five".