99071999 has 8 divisors (see below), whose sum is σ = 108706752. Its totient is φ = 89724960.

The previous prime is 99071989. The next prime is 99072007. The reversal of 99071999 is 99917099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99071999 - 2¹⁶ = 99006463 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99071999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99071989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71207 + ... + 72584.

It is an arithmetic number, because the mean of its divisors is an integer number (13588344).

Almost surely, 2^99071999 is an apocalyptic number.

99071999 is a deficient number, since it is larger than the sum of its proper divisors (9634753).

99071999 is a wasteful number, since it uses less digits than its factorization.

99071999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143857.

The product of its (nonzero) digits is 413343, while the sum is 53.

The square root of 99071999 is about 9953.4917993637. The cubic root of 99071999 is about 462.7186192158.

The spelling of 99071999 in words is "ninety-nine million, seventy-one thousand, nine hundred ninety-nine".