99491971 has 6 divisors (see below), whose sum is σ = 101407460. Its totient is φ = 97612008.

The previous prime is 99491941. The next prime is 99492013. The reversal of 99491971 is 17919499.

It is a happy number.

It is not a de Polignac number, because 99491971 - 2⁹ = 99491459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99491911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14901 + ... + 20518.

Almost surely, 2^99491971 is an apocalyptic number.

99491971 is a deficient number, since it is larger than the sum of its proper divisors (1915489).

99491971 is an equidigital number, since it uses as much as digits as its factorization.

99491971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35525 (or 35472 counting only the distinct ones).

The product of its digits is 183708, while the sum is 49.

The square root of 99491971 is about 9974.5662061064. The cubic root of 99491971 is about 463.3715279430.

The spelling of 99491971 in words is "ninety-nine million, four hundred ninety-one thousand, nine hundred seventy-one".