63940191 has 16 divisors (see below), whose sum is σ = 97611264. Its totient is φ = 36470304.

The previous prime is 63940159. The next prime is 63940193. The reversal of 63940191 is 19104936.

It is not a de Polignac number, because 63940191 - 2⁵ = 63940159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63940193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10390 + ... + 15356.

It is an arithmetic number, because the mean of its divisors is an integer number (6100704).

Almost surely, 2^63940191 is an apocalyptic number.

63940191 is a deficient number, since it is larger than the sum of its proper divisors (33671073).

63940191 is a wasteful number, since it uses less digits than its factorization.

63940191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5590.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 63940191 is about 7996.2610637722. The cubic root of 63940191 is about 399.8753590823.

The spelling of 63940191 in words is "sixty-three million, nine hundred forty thousand, one hundred ninety-one".