99491173 has 2 divisors, whose sum is σ = 99491174. Its totient is φ = 99491172.

The previous prime is 99491071. The next prime is 99491177. The reversal of 99491173 is 37119499.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91527489 + 7963684 = 9567^2 + 2822^2 .

It is an emirp because it is prime and its reverse (37119499) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99491173 - 2⁹ = 99490661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99491177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49745586 + 49745587.

It is an arithmetic number, because the mean of its divisors is an integer number (49745587).

Almost surely, 2^99491173 is an apocalyptic number.

It is an amenable number.

99491173 is a deficient number, since it is larger than the sum of its proper divisors (1).

99491173 is an equidigital number, since it uses as much as digits as its factorization.

99491173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 43.

The square root of 99491173 is about 9974.5262042866. The cubic root of 99491173 is about 463.3702890777.

The spelling of 99491173 in words is "ninety-nine million, four hundred ninety-one thousand, one hundred seventy-three".