91427918479 has 2 divisors, whose sum is σ = 91427918480. Its totient is φ = 91427918478.

The previous prime is 91427918441. The next prime is 91427918497. The reversal of 91427918479 is 97481972419.

Together with next prime (91427918497) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91427918479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91427918419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45713959239 + 45713959240.

It is an arithmetic number, because the mean of its divisors is an integer number (45713959240).

Almost surely, 2^91427918479 is an apocalyptic number.

91427918479 is a deficient number, since it is larger than the sum of its proper divisors (1).

91427918479 is an equidigital number, since it uses as much as digits as its factorization.

91427918479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 61.

The spelling of 91427918479 in words is "ninety-one billion, four hundred twenty-seven million, nine hundred eighteen thousand, four hundred seventy-nine".