63015891 has 4 divisors (see below), whose sum is σ = 84021192. Its totient is φ = 42010592.

The previous prime is 63015871. The next prime is 63015899. The reversal of 63015891 is 19851036.

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

It is a cyclic number.

It is not a de Polignac number, because 63015891 - 2⁷ = 63015763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63015899) 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, 10502646 + ... + 10502651.

It is an arithmetic number, because the mean of its divisors is an integer number (21005298).

Almost surely, 2^63015891 is an apocalyptic number.

63015891 is a deficient number, since it is larger than the sum of its proper divisors (21005301).

63015891 is a wasteful number, since it uses less digits than its factorization.

63015891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21005300.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 63015891 is about 7938.2549089835. The cubic root of 63015891 is about 397.9391736375.

The spelling of 63015891 in words is "sixty-three million, fifteen thousand, eight hundred ninety-one".