91243597 has 2 divisors, whose sum is σ = 91243598. Its totient is φ = 91243596.

The previous prime is 91243561. The next prime is 91243609. The reversal of 91243597 is 79534219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88247236 + 2996361 = 9394^2 + 1731^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91243597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91243547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45621798 + 45621799.

It is an arithmetic number, because the mean of its divisors is an integer number (45621799).

Almost surely, 2^91243597 is an apocalyptic number.

It is an amenable number.

91243597 is a deficient number, since it is larger than the sum of its proper divisors (1).

91243597 is an equidigital number, since it uses as much as digits as its factorization.

91243597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 40.

The square root of 91243597 is about 9552.1514330542. The cubic root of 91243597 is about 450.1951367684.

It can be divided in two parts, 9124 and 3597, that added together give a palindrome (12721).

The spelling of 91243597 in words is "ninety-one million, two hundred forty-three thousand, five hundred ninety-seven".