99555791 has 8 divisors (see below), whose sum is σ = 106024464. Its totient is φ = 93155200.

The previous prime is 99555767. The next prime is 99555803. The reversal of 99555791 is 19755599.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99555791 is a prime.

It is a super-2 number, since 2×99555791² = 19822711043271362, 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 (99555751) 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, 13985 + ... + 19866.

It is an arithmetic number, because the mean of its divisors is an integer number (13253058).

Almost surely, 2^99555791 is an apocalyptic number.

99555791 is a deficient number, since it is larger than the sum of its proper divisors (6468673).

99555791 is a wasteful number, since it uses less digits than its factorization.

99555791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34041.

The product of its digits is 637875, while the sum is 50.

The square root of 99555791 is about 9977.7648298604. The cubic root of 99555791 is about 463.4705846800.

The spelling of 99555791 in words is "ninety-nine million, five hundred fifty-five thousand, seven hundred ninety-one".