91623199 has 2 divisors, whose sum is σ = 91623200. Its totient is φ = 91623198.

The previous prime is 91623143. The next prime is 91623221. The reversal of 91623199 is 99132619.

It is a strong prime.

It is an emirp because it is prime and its reverse (99132619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91623199 - 2⁷ = 91623071 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91623109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45811599 + 45811600.

It is an arithmetic number, because the mean of its divisors is an integer number (45811600).

Almost surely, 2^91623199 is an apocalyptic number.

91623199 is a deficient number, since it is larger than the sum of its proper divisors (1).

91623199 is an equidigital number, since it uses as much as digits as its factorization.

91623199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26244, while the sum is 40.

The square root of 91623199 is about 9572.0007835353. Note that the first 3 decimals coincide. The cubic root of 91623199 is about 450.8185906651.

The spelling of 91623199 in words is "ninety-one million, six hundred twenty-three thousand, one hundred ninety-nine".