91779098951 has 2 divisors, whose sum is σ = 91779098952. Its totient is φ = 91779098950.

The previous prime is 91779098933. The next prime is 91779098977. The reversal of 91779098951 is 15989097719.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91779098951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91779098921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45889549475 + 45889549476.

It is an arithmetic number, because the mean of its divisors is an integer number (45889549476).

Almost surely, 2^91779098951 is an apocalyptic number.

91779098951 is a deficient number, since it is larger than the sum of its proper divisors (1).

91779098951 is an equidigital number, since it uses as much as digits as its factorization.

91779098951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12859560, while the sum is 65.

The spelling of 91779098951 in words is "ninety-one billion, seven hundred seventy-nine million, ninety-eight thousand, nine hundred fifty-one".