99870791 has 4 divisors (see below), whose sum is σ = 100023000. Its totient is φ = 99718584.

The previous prime is 99870787. The next prime is 99870833. The reversal of 99870791 is 19707899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19707899 = 47 ⋅419317.

It is a cyclic number.

It is not a de Polignac number, because 99870791 - 2² = 99870787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99870781) 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, 75116 + ... + 76433.

It is an arithmetic number, because the mean of its divisors is an integer number (25005750).

Almost surely, 2^99870791 is an apocalyptic number.

99870791 is a deficient number, since it is larger than the sum of its proper divisors (152209).

99870791 is a wasteful number, since it uses less digits than its factorization.

99870791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152208.

The product of its (nonzero) digits is 285768, while the sum is 50.

The square root of 99870791 is about 9993.5374617800. The cubic root of 99870791 is about 463.9588855143.

The spelling of 99870791 in words is "ninety-nine million, eight hundred seventy thousand, seven hundred ninety-one".