91897198859 has 2 divisors, whose sum is σ = 91897198860. Its totient is φ = 91897198858.

The previous prime is 91897198847. The next prime is 91897198867. The reversal of 91897198859 is 95889179819.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91897198859 is a prime.

It is not a weakly prime, because it can be changed into another prime (91897198759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45948599429 + 45948599430.

It is an arithmetic number, because the mean of its divisors is an integer number (45948599430).

Almost surely, 2^91897198859 is an apocalyptic number.

91897198859 is a deficient number, since it is larger than the sum of its proper divisors (1).

91897198859 is an equidigital number, since it uses as much as digits as its factorization.

91897198859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117573120, while the sum is 74.

The spelling of 91897198859 in words is "ninety-one billion, eight hundred ninety-seven million, one hundred ninety-eight thousand, eight hundred fifty-nine".