639925411 has 2 divisors, whose sum is σ = 639925412. Its totient is φ = 639925410.

The previous prime is 639925409. The next prime is 639925421. The reversal of 639925411 is 114529936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639925411 - 2¹ = 639925409 is a prime.

Together with 639925409, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (639925421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319962705 + 319962706.

It is an arithmetic number, because the mean of its divisors is an integer number (319962706).

Almost surely, 2^639925411 is an apocalyptic number.

639925411 is a deficient number, since it is larger than the sum of its proper divisors (1).

639925411 is an equidigital number, since it uses as much as digits as its factorization.

639925411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 40.

The square root of 639925411 is about 25296.7470438395. The cubic root of 639925411 is about 861.7403961435.

The spelling of 639925411 in words is "six hundred thirty-nine million, nine hundred twenty-five thousand, four hundred eleven".