63634491 has 20 divisors (see below), whose sum is σ = 99194832. Its totient is φ = 40577328.

The previous prime is 63634489. The next prime is 63634499. The reversal of 63634491 is 19443636.

It is not a de Polignac number, because 63634491 - 2¹ = 63634489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63634499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15216 + ... + 18941.

Almost surely, 2^63634491 is an apocalyptic number.

63634491 is a deficient number, since it is larger than the sum of its proper divisors (35560341).

63634491 is a wasteful number, since it uses less digits than its factorization.

63634491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34192 (or 34183 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 63634491 is about 7977.1229776154. The cubic root of 63634491 is about 399.2370686813.

The spelling of 63634491 in words is "sixty-three million, six hundred thirty-four thousand, four hundred ninety-one".