63542639 has 2 divisors, whose sum is σ = 63542640. Its totient is φ = 63542638.

The previous prime is 63542627. The next prime is 63542659. The reversal of 63542639 is 93624536.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63542639 - 2¹⁶ = 63477103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63542659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31771319 + 31771320.

It is an arithmetic number, because the mean of its divisors is an integer number (31771320).

Almost surely, 2^63542639 is an apocalyptic number.

63542639 is a deficient number, since it is larger than the sum of its proper divisors (1).

63542639 is an equidigital number, since it uses as much as digits as its factorization.

63542639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 38.

The square root of 63542639 is about 7971.3636850918. The cubic root of 63542639 is about 399.0448857907.

The spelling of 63542639 in words is "sixty-three million, five hundred forty-two thousand, six hundred thirty-nine".