91465736231509 has 2 divisors, whose sum is σ = 91465736231510. Its totient is φ = 91465736231508.

The previous prime is 91465736231459. The next prime is 91465736231587. The reversal of 91465736231509 is 90513263756419.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68230656234225 + 23235079997284 = 8260185^2 + 4820278^2 .

It is a cyclic number.

It is not a de Polignac number, because 91465736231509 - 2¹⁹ = 91465735707221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91460736231509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45732868115754 + 45732868115755.

It is an arithmetic number, because the mean of its divisors is an integer number (45732868115755).

Almost surely, 2^{91465736231509} is an apocalyptic number.

It is an amenable number.

91465736231509 is a deficient number, since it is larger than the sum of its proper divisors (1).

91465736231509 is an equidigital number, since it uses as much as digits as its factorization.

91465736231509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36741600, while the sum is 61.

The spelling of 91465736231509 in words is "ninety-one trillion, four hundred sixty-five billion, seven hundred thirty-six million, two hundred thirty-one thousand, five hundred nine".