99142891 has 2 divisors, whose sum is σ = 99142892. Its totient is φ = 99142890.

The previous prime is 99142889. The next prime is 99143047. The reversal of 99142891 is 19824199.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99142891 - 2¹ = 99142889 is a prime.

Together with 99142889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (99142801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49571445 + 49571446.

It is an arithmetic number, because the mean of its divisors is an integer number (49571446).

Almost surely, 2^99142891 is an apocalyptic number.

99142891 is a deficient number, since it is larger than the sum of its proper divisors (1).

99142891 is an equidigital number, since it uses as much as digits as its factorization.

99142891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 43.

The square root of 99142891 is about 9957.0523248600. The cubic root of 99142891 is about 462.8289606093.

The spelling of 99142891 in words is "ninety-nine million, one hundred forty-two thousand, eight hundred ninety-one".