91642050889 has 2 divisors, whose sum is σ = 91642050890. Its totient is φ = 91642050888.

The previous prime is 91642050833. The next prime is 91642050901. The reversal of 91642050889 is 98805024619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63135105289 + 28506945600 = 251267^2 + 168840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91642050889 is a prime.

It is a super-2 number, since 2×91642050889² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91642050289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45821025444 + 45821025445.

It is an arithmetic number, because the mean of its divisors is an integer number (45821025445).

Almost surely, 2^91642050889 is an apocalyptic number.

It is an amenable number.

91642050889 is a deficient number, since it is larger than the sum of its proper divisors (1).

91642050889 is an equidigital number, since it uses as much as digits as its factorization.

91642050889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The spelling of 91642050889 in words is "ninety-one billion, six hundred forty-two million, fifty thousand, eight hundred eighty-nine".