63691513 has 2 divisors, whose sum is σ = 63691514. Its totient is φ = 63691512.

The previous prime is 63691493. The next prime is 63691517. The reversal of 63691513 is 31519636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41062464 + 22629049 = 6408^2 + 4757^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63691513 is a prime.

It is not a weakly prime, because it can be changed into another prime (63691517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31845756 + 31845757.

It is an arithmetic number, because the mean of its divisors is an integer number (31845757).

Almost surely, 2^63691513 is an apocalyptic number.

It is an amenable number.

63691513 is a deficient number, since it is larger than the sum of its proper divisors (1).

63691513 is an equidigital number, since it uses as much as digits as its factorization.

63691513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14580, while the sum is 34.

The square root of 63691513 is about 7980.6962728825. The cubic root of 63691513 is about 399.3562833780.

The spelling of 63691513 in words is "sixty-three million, six hundred ninety-one thousand, five hundred thirteen".