91026423 has 20 divisors (see below), whose sum is σ = 136571248. Its totient is φ = 60419520.

The previous prime is 91026409. The next prime is 91026427. The reversal of 91026423 is 32462019.

91026423 is a `hidden beast` number, since 9 + 10 + 2 + 642 + 3 = 666.

It is not a de Polignac number, because 91026423 - 2⁵ = 91026391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91026427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17190 + ... + 21852.

Almost surely, 2^91026423 is an apocalyptic number.

91026423 is a deficient number, since it is larger than the sum of its proper divisors (45544825).

91026423 is a wasteful number, since it uses less digits than its factorization.

91026423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4916 (or 4907 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 91026423 is about 9540.7768551623. The cubic root of 91026423 is about 449.8376747860.

The spelling of 91026423 in words is "ninety-one million, twenty-six thousand, four hundred twenty-three".