99912071 has 4 divisors (see below), whose sum is σ = 114185232. Its totient is φ = 85638912.

The previous prime is 99912053. The next prime is 99912073. The reversal of 99912071 is 17021999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17021999 = 1583 ⋅10753.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99912071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99912073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7136570 + ... + 7136583.

It is an arithmetic number, because the mean of its divisors is an integer number (28546308).

Almost surely, 2^99912071 is an apocalyptic number.

99912071 is a deficient number, since it is larger than the sum of its proper divisors (14273161).

99912071 is a wasteful number, since it uses less digits than its factorization.

99912071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14273160.

The product of its (nonzero) digits is 10206, while the sum is 38.

The square root of 99912071 is about 9995.6025831362. The cubic root of 99912071 is about 464.0228000464.

The spelling of 99912071 in words is "ninety-nine million, nine hundred twelve thousand, seventy-one".