91338623 has 2 divisors, whose sum is σ = 91338624. Its totient is φ = 91338622.

The previous prime is 91338619. The next prime is 91338629. The reversal of 91338623 is 32683319.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91338623 - 2² = 91338619 is a prime.

It is a super-2 number, since 2×91338623² = 16685488103072258, which contains 22 as substring.

It is equal to p_5290199 and since 91338623 and 5290199 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91338629) 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 as a sum of consecutive naturals, namely, 45669311 + 45669312.

It is an arithmetic number, because the mean of its divisors is an integer number (45669312).

Almost surely, 2^91338623 is an apocalyptic number.

91338623 is a deficient number, since it is larger than the sum of its proper divisors (1).

91338623 is an equidigital number, since it uses as much as digits as its factorization.

91338623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 35.

The square root of 91338623 is about 9557.1242013484. The cubic root of 91338623 is about 450.3513683720.

The spelling of 91338623 in words is "ninety-one million, three hundred thirty-eight thousand, six hundred twenty-three".