63997901 has 8 divisors (see below), whose sum is σ = 71703264. Its totient is φ = 56607120.

The previous prime is 63997873. The next prime is 63997951. The reversal of 63997901 is 10979936.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 63997901 - 2¹⁴ = 63981517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63997951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78215 + ... + 79028.

It is an arithmetic number, because the mean of its divisors is an integer number (8962908).

Almost surely, 2^63997901 is an apocalyptic number.

It is an amenable number.

63997901 is a deficient number, since it is larger than the sum of its proper divisors (7705363).

63997901 is a wasteful number, since it uses less digits than its factorization.

63997901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157291.

The product of its (nonzero) digits is 91854, while the sum is 44.

The square root of 63997901 is about 7999.8688114243. The cubic root of 63997901 is about 399.9956270355.

The spelling of 63997901 in words is "sixty-three million, nine hundred ninety-seven thousand, nine hundred one".