91792889 has 2 divisors, whose sum is σ = 91792890. Its totient is φ = 91792888.

The previous prime is 91792867. The next prime is 91792919. The reversal of 91792889 is 98829719.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89491600 + 2301289 = 9460^2 + 1517^2 .

It is an emirp because it is prime and its reverse (98829719) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91792889 - 2¹² = 91788793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91792889.

It is not a weakly prime, because it can be changed into another prime (91792189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45896444 + 45896445.

It is an arithmetic number, because the mean of its divisors is an integer number (45896445).

Almost surely, 2^91792889 is an apocalyptic number.

It is an amenable number.

91792889 is a deficient number, since it is larger than the sum of its proper divisors (1).

91792889 is an equidigital number, since it uses as much as digits as its factorization.

91792889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 53.

The square root of 91792889 is about 9580.8605563384. The cubic root of 91792889 is about 451.0967306606.

The spelling of 91792889 in words is "ninety-one million, seven hundred ninety-two thousand, eight hundred eighty-nine".