63891293 has 2 divisors, whose sum is σ = 63891294. Its totient is φ = 63891292.

The previous prime is 63891259. The next prime is 63891301. The reversal of 63891293 is 39219836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62047129 + 1844164 = 7877^2 + 1358^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63891293 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 63891293.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63896293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31945646 + 31945647.

It is an arithmetic number, because the mean of its divisors is an integer number (31945647).

Almost surely, 2^63891293 is an apocalyptic number.

It is an amenable number.

63891293 is a deficient number, since it is larger than the sum of its proper divisors (1).

63891293 is an equidigital number, since it uses as much as digits as its factorization.

63891293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 41.

The square root of 63891293 is about 7993.2029249857. The cubic root of 63891293 is about 399.7733987372.

The spelling of 63891293 in words is "sixty-three million, eight hundred ninety-one thousand, two hundred ninety-three".