3121890225 has 24 divisors (see below), whose sum is σ = 5188572672. Its totient is φ = 1656283200.

The previous prime is 3121890199. The next prime is 3121890283. The reversal of 3121890225 is 5220981213.

It is a happy number.

It is not a de Polignac number, because 3121890225 - 2⁵ = 3121890193 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94642 + ... + 123291.

It is an arithmetic number, because the mean of its divisors is an integer number (216190528).

Almost surely, 2^3121890225 is an apocalyptic number.

It is an amenable number.

3121890225 is a deficient number, since it is larger than the sum of its proper divisors (2066682447).

3121890225 is a wasteful number, since it uses less digits than its factorization.

3121890225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218137 (or 218132 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 3121890225 is about 55873.8778410806. The cubic root of 3121890225 is about 1461.5237461637.

The spelling of 3121890225 in words is "three billion, one hundred twenty-one million, eight hundred ninety thousand, two hundred twenty-five".