91139258369 has 2 divisors, whose sum is σ = 91139258370. Its totient is φ = 91139258368.

The previous prime is 91139258341. The next prime is 91139258401. The reversal of 91139258369 is 96385293119.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86958342769 + 4180915600 = 294887^2 + 64660^2 .

It is a cyclic number.

It is not a de Polignac number, because 91139258369 - 2⁸ = 91139258113 is a prime.

It is a super-2 number, since 2×91139258369² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91139258869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45569629184 + 45569629185.

It is an arithmetic number, because the mean of its divisors is an integer number (45569629185).

Almost surely, 2^91139258369 is an apocalyptic number.

It is an amenable number.

91139258369 is a deficient number, since it is larger than the sum of its proper divisors (1).

91139258369 is an equidigital number, since it uses as much as digits as its factorization.

91139258369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3149280, while the sum is 56.

The spelling of 91139258369 in words is "ninety-one billion, one hundred thirty-nine million, two hundred fifty-eight thousand, three hundred sixty-nine".