91209031423 has 2 divisors, whose sum is σ = 91209031424. Its totient is φ = 91209031422.

The previous prime is 91209031399. The next prime is 91209031427. The reversal of 91209031423 is 32413090219.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91209031423 - 2¹⁷ = 91208900351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91209031427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45604515711 + 45604515712.

It is an arithmetic number, because the mean of its divisors is an integer number (45604515712).

Almost surely, 2^91209031423 is an apocalyptic number.

91209031423 is a deficient number, since it is larger than the sum of its proper divisors (1).

91209031423 is an equidigital number, since it uses as much as digits as its factorization.

91209031423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The spelling of 91209031423 in words is "ninety-one billion, two hundred nine million, thirty-one thousand, four hundred twenty-three".