108521489491 has 2 divisors, whose sum is σ = 108521489492. Its totient is φ = 108521489490.

The previous prime is 108521489449. The next prime is 108521489507. The reversal of 108521489491 is 194984125801.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108521489491 is a prime.

It is not a weakly prime, because it can be changed into another prime (108521489431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54260744745 + 54260744746.

It is an arithmetic number, because the mean of its divisors is an integer number (54260744746).

Almost surely, 2^108521489491 is an apocalyptic number.

108521489491 is a deficient number, since it is larger than the sum of its proper divisors (1).

108521489491 is an equidigital number, since it uses as much as digits as its factorization.

108521489491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 52.

The spelling of 108521489491 in words is "one hundred eight billion, five hundred twenty-one million, four hundred eighty-nine thousand, four hundred ninety-one".