31145025 has 24 divisors (see below), whose sum is σ = 51987744. Its totient is φ = 16451200.

The previous prime is 31145011. The next prime is 31145027. The reversal of 31145025 is 52054113.

It is not a de Polignac number, because 31145025 - 2⁶ = 31144961 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31144992 and 31145010.

It is not an unprimeable number, because it can be changed into a prime (31145027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6085 + ... + 9965.

It is an arithmetic number, because the mean of its divisors is an integer number (2166156).

Almost surely, 2^31145025 is an apocalyptic number.

It is an amenable number.

31145025 is a deficient number, since it is larger than the sum of its proper divisors (20842719).

31145025 is a wasteful number, since it uses less digits than its factorization.

31145025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4001 (or 3996 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 31145025 is about 5580.7727959486. The cubic root of 31145025 is about 314.6271729127.

Adding to 31145025 its reverse (52054113), we get a palindrome (83199138).

The spelling of 31145025 in words is "thirty-one million, one hundred forty-five thousand, twenty-five".