63139639 has 2 divisors, whose sum is σ = 63139640. Its totient is φ = 63139638.

The previous prime is 63139633. The next prime is 63139691. The reversal of 63139639 is 93693136.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63139639 - 2⁵ = 63139607 is a prime.

It is a super-2 number, since 2×63139639² = 7973228026100642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63139633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31569819 + 31569820.

It is an arithmetic number, because the mean of its divisors is an integer number (31569820).

Almost surely, 2^63139639 is an apocalyptic number.

63139639 is a deficient number, since it is larger than the sum of its proper divisors (1).

63139639 is an equidigital number, since it uses as much as digits as its factorization.

63139639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78732, while the sum is 40.

The square root of 63139639 is about 7946.0454944582. The cubic root of 63139639 is about 398.1994888090.

The spelling of 63139639 in words is "sixty-three million, one hundred thirty-nine thousand, six hundred thirty-nine".