99191671 has 2 divisors, whose sum is σ = 99191672. Its totient is φ = 99191670.

The previous prime is 99191639. The next prime is 99191681. The reversal of 99191671 is 17619199.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99191671 - 2⁵ = 99191639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99191681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49595835 + 49595836.

It is an arithmetic number, because the mean of its divisors is an integer number (49595836).

Almost surely, 2^99191671 is an apocalyptic number.

99191671 is a deficient number, since it is larger than the sum of its proper divisors (1).

99191671 is an equidigital number, since it uses as much as digits as its factorization.

99191671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618, while the sum is 43.

The square root of 99191671 is about 9959.5015437521. The cubic root of 99191671 is about 462.9048547548.

The spelling of 99191671 in words is "ninety-nine million, one hundred ninety-one thousand, six hundred seventy-one".