633481108891 has 2 divisors, whose sum is σ = 633481108892. Its totient is φ = 633481108890.

The previous prime is 633481108801. The next prime is 633481108921. The reversal of 633481108891 is 198801184336.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 633481108891 - 2¹⁹ = 633480584603 is a prime.

It is not a weakly prime, because it can be changed into another prime (633481108801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316740554445 + 316740554446.

It is an arithmetic number, because the mean of its divisors is an integer number (316740554446).

Almost surely, 2^633481108891 is an apocalyptic number.

633481108891 is a deficient number, since it is larger than the sum of its proper divisors (1).

633481108891 is an equidigital number, since it uses as much as digits as its factorization.

633481108891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 52.

The spelling of 633481108891 in words is "six hundred thirty-three billion, four hundred eighty-one million, one hundred eight thousand, eight hundred ninety-one".