63696491 has 2 divisors, whose sum is σ = 63696492. Its totient is φ = 63696490.

The previous prime is 63696473. The next prime is 63696497. The reversal of 63696491 is 19469636.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63696491 - 2²² = 59502187 is a prime.

It is not a weakly prime, because it can be changed into another prime (63696497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31848245 + 31848246.

It is an arithmetic number, because the mean of its divisors is an integer number (31848246).

Almost surely, 2^63696491 is an apocalyptic number.

63696491 is a deficient number, since it is larger than the sum of its proper divisors (1).

63696491 is an equidigital number, since it uses as much as digits as its factorization.

63696491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 44.

The square root of 63696491 is about 7981.0081443387. The cubic root of 63696491 is about 399.3666874004.

The spelling of 63696491 in words is "sixty-three million, six hundred ninety-six thousand, four hundred ninety-one".