63355891 has 2 divisors, whose sum is σ = 63355892. Its totient is φ = 63355890.

The previous prime is 63355879. The next prime is 63355907. The reversal of 63355891 is 19855336.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63355891 - 2¹³ = 63347699 is a prime.

It is not a weakly prime, because it can be changed into another prime (63355811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31677945 + 31677946.

It is an arithmetic number, because the mean of its divisors is an integer number (31677946).

Almost surely, 2^63355891 is an apocalyptic number.

63355891 is a deficient number, since it is larger than the sum of its proper divisors (1).

63355891 is an equidigital number, since it uses as much as digits as its factorization.

63355891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97200, while the sum is 40.

The square root of 63355891 is about 7959.6413863942. The cubic root of 63355891 is about 398.6535792128.

It can be divided in two parts, 63355 and 891, that added together give a palindrome (64246).

The spelling of 63355891 in words is "sixty-three million, three hundred fifty-five thousand, eight hundred ninety-one".