63697939 has 2 divisors, whose sum is σ = 63697940. Its totient is φ = 63697938.

The previous prime is 63697919. The next prime is 63697951. The reversal of 63697939 is 93979636.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63697939 - 2²⁵ = 30143507 is a prime.

It is not a weakly prime, because it can be changed into another prime (63697919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31848969 + 31848970.

It is an arithmetic number, because the mean of its divisors is an integer number (31848970).

Almost surely, 2^63697939 is an apocalyptic number.

63697939 is a deficient number, since it is larger than the sum of its proper divisors (1).

63697939 is an equidigital number, since it uses as much as digits as its factorization.

63697939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1653372, while the sum is 52.

The square root of 63697939 is about 7981.0988591797. The cubic root of 63697939 is about 399.3697136193.

The spelling of 63697939 in words is "sixty-three million, six hundred ninety-seven thousand, nine hundred thirty-nine".