91158101773 has 2 divisors, whose sum is σ = 91158101774. Its totient is φ = 91158101772.

The previous prime is 91158101759. The next prime is 91158101819. The reversal of 91158101773 is 37710185119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70903973284 + 20254128489 = 266278^2 + 142317^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91158101773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91158101753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45579050886 + 45579050887.

It is an arithmetic number, because the mean of its divisors is an integer number (45579050887).

Almost surely, 2^91158101773 is an apocalyptic number.

It is an amenable number.

91158101773 is a deficient number, since it is larger than the sum of its proper divisors (1).

91158101773 is an equidigital number, since it uses as much as digits as its factorization.

91158101773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 43.

The spelling of 91158101773 in words is "ninety-one billion, one hundred fifty-eight million, one hundred one thousand, seven hundred seventy-three".