91673899 has 2 divisors, whose sum is σ = 91673900. Its totient is φ = 91673898.

The previous prime is 91673887. The next prime is 91673903. The reversal of 91673899 is 99837619.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91673899 - 2⁵ = 91673867 is a prime.

It is not a weakly prime, because it can be changed into another prime (91673839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45836949 + 45836950.

It is an arithmetic number, because the mean of its divisors is an integer number (45836950).

Almost surely, 2^91673899 is an apocalyptic number.

91673899 is a deficient number, since it is larger than the sum of its proper divisors (1).

91673899 is an equidigital number, since it uses as much as digits as its factorization.

91673899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 52.

The square root of 91673899 is about 9574.6487664039. The cubic root of 91673899 is about 450.9017293177.

The spelling of 91673899 in words is "ninety-one million, six hundred seventy-three thousand, eight hundred ninety-nine".