91279423 has 2 divisors, whose sum is σ = 91279424. Its totient is φ = 91279422.

The previous prime is 91279421. The next prime is 91279427. The reversal of 91279423 is 32497219.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91279423 - 2¹ = 91279421 is a prime.

Together with 91279421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91279421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45639711 + 45639712.

It is an arithmetic number, because the mean of its divisors is an integer number (45639712).

Almost surely, 2^91279423 is an apocalyptic number.

91279423 is a deficient number, since it is larger than the sum of its proper divisors (1).

91279423 is an equidigital number, since it uses as much as digits as its factorization.

91279423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 37.

The square root of 91279423 is about 9554.0265333523. The cubic root of 91279423 is about 450.2540507855.

The spelling of 91279423 in words is "ninety-one million, two hundred seventy-nine thousand, four hundred twenty-three".