91974973423 has 2 divisors, whose sum is σ = 91974973424. Its totient is φ = 91974973422.

The previous prime is 91974973339. The next prime is 91974973459. The reversal of 91974973423 is 32437947919.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91974973423 - 2⁹ = 91974972911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91974673423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45987486711 + 45987486712.

It is an arithmetic number, because the mean of its divisors is an integer number (45987486712).

Almost surely, 2^91974973423 is an apocalyptic number.

91974973423 is a deficient number, since it is larger than the sum of its proper divisors (1).

91974973423 is an equidigital number, since it uses as much as digits as its factorization.

91974973423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10287648, while the sum is 58.

The spelling of 91974973423 in words is "ninety-one billion, nine hundred seventy-four million, nine hundred seventy-three thousand, four hundred twenty-three".