63145891 has 2 divisors, whose sum is σ = 63145892. Its totient is φ = 63145890.

The previous prime is 63145883. The next prime is 63145897. The reversal of 63145891 is 19854136.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63145891 - 2³ = 63145883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63145891.

It is not a weakly prime, because it can be changed into another prime (63145897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31572945 + 31572946.

It is an arithmetic number, because the mean of its divisors is an integer number (31572946).

Almost surely, 2^63145891 is an apocalyptic number.

63145891 is a deficient number, since it is larger than the sum of its proper divisors (1).

63145891 is an equidigital number, since it uses as much as digits as its factorization.

63145891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 63145891 is about 7946.4388879548. The cubic root of 63145891 is about 398.2126314300.

The spelling of 63145891 in words is "sixty-three million, one hundred forty-five thousand, eight hundred ninety-one".