52639999 has 2 divisors, whose sum is σ = 52640000. Its totient is φ = 52639998.

The previous prime is 52639997. The next prime is 52640053. The reversal of 52639999 is 99993625.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 52639999 - 2¹ = 52639997 is a prime.

Together with 52639997, it forms a pair of twin primes.

52639999 is a modest number, since divided by 9999 gives 5263 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52639997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26319999 + 26320000.

It is an arithmetic number, because the mean of its divisors is an integer number (26320000).

Almost surely, 2^52639999 is an apocalyptic number.

52639999 is a deficient number, since it is larger than the sum of its proper divisors (1).

52639999 is an equidigital number, since it uses as much as digits as its factorization.

52639999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1180980, while the sum is 52.

The square root of 52639999 is about 7255.3427899721. The cubic root of 52639999 is about 374.7761603413.

The spelling of 52639999 in words is "fifty-two million, six hundred thirty-nine thousand, nine hundred ninety-nine".