91798419491 has 2 divisors, whose sum is σ = 91798419492. Its totient is φ = 91798419490.

The previous prime is 91798419487. The next prime is 91798419511. The reversal of 91798419491 is 19491489719.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91798419491 - 2² = 91798419487 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (91798416491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45899209745 + 45899209746.

It is an arithmetic number, because the mean of its divisors is an integer number (45899209746).

Almost surely, 2^91798419491 is an apocalyptic number.

91798419491 is a deficient number, since it is larger than the sum of its proper divisors (1).

91798419491 is an equidigital number, since it uses as much as digits as its factorization.

91798419491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 62.

The spelling of 91798419491 in words is "ninety-one billion, seven hundred ninety-eight million, four hundred nineteen thousand, four hundred ninety-one".