99919571 has 2 divisors, whose sum is σ = 99919572. Its totient is φ = 99919570.

The previous prime is 99919559. The next prime is 99919577. The reversal of 99919571 is 17591999.

It is a strong prime.

It is an emirp because it is prime and its reverse (17591999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99919571 - 2²⁶ = 32810707 is a prime.

It is not a weakly prime, because it can be changed into another prime (99919577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49959785 + 49959786.

It is an arithmetic number, because the mean of its divisors is an integer number (49959786).

Almost surely, 2^99919571 is an apocalyptic number.

99919571 is a deficient number, since it is larger than the sum of its proper divisors (1).

99919571 is an equidigital number, since it uses as much as digits as its factorization.

99919571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 229635, while the sum is 50.

The square root of 99919571 is about 9995.9777410717. The cubic root of 99919571 is about 464.0344105351.

The spelling of 99919571 in words is "ninety-nine million, nine hundred nineteen thousand, five hundred seventy-one".