639983151 has 12 divisors (see below), whose sum is σ = 930093528. Its totient is φ = 424036944.

The previous prime is 639983131. The next prime is 639983153. The reversal of 639983151 is 151389936.

639983151 is a `hidden beast` number, since 639 + 9 + 8 + 3 + 1 + 5 + 1 = 666.

It is not a de Polignac number, because 639983151 - 2⁶ = 639983087 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 639983097 and 639983106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639983153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 216660 + ... + 219593.

It is an arithmetic number, because the mean of its divisors is an integer number (77507794).

Almost surely, 2^639983151 is an apocalyptic number.

639983151 is a deficient number, since it is larger than the sum of its proper divisors (290110377).

639983151 is a wasteful number, since it uses less digits than its factorization.

639983151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436422 (or 436419 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 639983151 is about 25297.8882715534. Note that the first 3 decimals coincide. The cubic root of 639983151 is about 861.7663134318.

The spelling of 639983151 in words is "six hundred thirty-nine million, nine hundred eighty-three thousand, one hundred fifty-one".