91431536369269 has 2 divisors, whose sum is σ = 91431536369270. Its totient is φ = 91431536369268.

The previous prime is 91431536369197. The next prime is 91431536369321. The reversal of 91431536369269 is 96296363513419.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91154049736369 + 277486632900 = 9547463^2 + 526770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91431536369269 is a prime.

It is a super-2 number, since 2×91431536369269² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91431536169269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45715768184634 + 45715768184635.

It is an arithmetic number, because the mean of its divisors is an integer number (45715768184635).

Almost surely, 2^{91431536369269} is an apocalyptic number.

It is an amenable number.

91431536369269 is a deficient number, since it is larger than the sum of its proper divisors (1).

91431536369269 is an equidigital number, since it uses as much as digits as its factorization.

91431536369269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170061120, while the sum is 67.

The spelling of 91431536369269 in words is "ninety-one trillion, four hundred thirty-one billion, five hundred thirty-six million, three hundred sixty-nine thousand, two hundred sixty-nine".