63911091 has 4 divisors (see below), whose sum is σ = 85214792. Its totient is φ = 42607392.

The previous prime is 63911059. The next prime is 63911137. The reversal of 63911091 is 19011936.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 63911091 - 2⁵ = 63911059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63911021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10651846 + ... + 10651851.

It is an arithmetic number, because the mean of its divisors is an integer number (21303698).

Almost surely, 2^63911091 is an apocalyptic number.

63911091 is a deficient number, since it is larger than the sum of its proper divisors (21303701).

63911091 is a wasteful number, since it uses less digits than its factorization.

63911091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21303700.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 63911091 is about 7994.4412562730. The cubic root of 63911091 is about 399.8146870777.

The spelling of 63911091 in words is "sixty-three million, nine hundred eleven thousand, ninety-one".