91137023 has 2 divisors, whose sum is σ = 91137024. Its totient is φ = 91137022.

The previous prime is 91137001. The next prime is 91137041. The reversal of 91137023 is 32073119.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91137023 - 2¹⁸ = 90874879 is a prime.

It is a super-2 number, since 2×91137023² = 16611913922605058, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91136983 and 91137001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91137043) 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, 45568511 + 45568512.

It is an arithmetic number, because the mean of its divisors is an integer number (45568512).

Almost surely, 2^91137023 is an apocalyptic number.

91137023 is a deficient number, since it is larger than the sum of its proper divisors (1).

91137023 is an equidigital number, since it uses as much as digits as its factorization.

91137023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 91137023 is about 9546.5712693092. The cubic root of 91137023 is about 450.0197900762.

The spelling of 91137023 in words is "ninety-one million, one hundred thirty-seven thousand, twenty-three".