63715979 has 2 divisors, whose sum is σ = 63715980. Its totient is φ = 63715978.

The previous prime is 63715963. The next prime is 63715991. The reversal of 63715979 is 97951736.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63715979 - 2⁴ = 63715963 is a prime.

It is not a weakly prime, because it can be changed into another prime (63715909) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31857989 + 31857990.

It is an arithmetic number, because the mean of its divisors is an integer number (31857990).

Almost surely, 2^63715979 is an apocalyptic number.

63715979 is a deficient number, since it is larger than the sum of its proper divisors (1).

63715979 is an equidigital number, since it uses as much as digits as its factorization.

63715979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 357210, while the sum is 47.

The square root of 63715979 is about 7982.2289493599. The cubic root of 63715979 is about 399.4074121159.

It can be divided in two parts, 637159 and 79, that multiplied together give a triangular number (50335561 = T₁₀₀₃₃).

The spelling of 63715979 in words is "sixty-three million, seven hundred fifteen thousand, nine hundred seventy-nine".