6390225981 has 12 divisors (see below), whose sum is σ = 9300788640. Its totient is φ = 4227629640.

The previous prime is 6390225943. The next prime is 6390225997. The reversal of 6390225981 is 1895220936.

6390225981 is a `hidden beast` number, since 6 + 39 + 0 + 22 + 598 + 1 = 666.

It is not a de Polignac number, because 6390225981 - 2⁶ = 6390225917 is a prime.

It is a super-2 number, since 2×6390225981² = 81669976176494824722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6390225911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2708841 + ... + 2711198.

It is an arithmetic number, because the mean of its divisors is an integer number (775065720).

Almost surely, 2^6390225981 is an apocalyptic number.

It is an amenable number.

6390225981 is a deficient number, since it is larger than the sum of its proper divisors (2910562659).

6390225981 is a wasteful number, since it uses less digits than its factorization.

6390225981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5420176 (or 5420173 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 6390225981 is about 79938.8890403163. The cubic root of 6390225981 is about 1855.6899065339.

The spelling of 6390225981 in words is "six billion, three hundred ninety million, two hundred twenty-five thousand, nine hundred eighty-one".