99945791 has 4 divisors (see below), whose sum is σ = 109031784. Its totient is φ = 90859800.

The previous prime is 99945763. The next prime is 99945817. The reversal of 99945791 is 19754999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99945791 is a prime.

It is a super-2 number, since 2×99945791² = 19978322277231362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99945721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4542980 + ... + 4543001.

It is an arithmetic number, because the mean of its divisors is an integer number (27257946).

Almost surely, 2^99945791 is an apocalyptic number.

99945791 is a deficient number, since it is larger than the sum of its proper divisors (9085993).

99945791 is a wasteful number, since it uses less digits than its factorization.

99945791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9085992.

The product of its digits is 918540, while the sum is 53.

The square root of 99945791 is about 9997.2891825734. The cubic root of 99945791 is about 464.0749962383.

The spelling of 99945791 in words is "ninety-nine million, nine hundred forty-five thousand, seven hundred ninety-one".