99505779 has 4 divisors (see below), whose sum is σ = 132674376. Its totient is φ = 66337184.

The previous prime is 99505739. The next prime is 99505807. The reversal of 99505779 is 97750599.

It is a happy number.

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-99505779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99505739) 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, 16584294 + ... + 16584299.

It is an arithmetic number, because the mean of its divisors is an integer number (33168594).

Almost surely, 2^99505779 is an apocalyptic number.

99505779 is a deficient number, since it is larger than the sum of its proper divisors (33168597).

99505779 is a wasteful number, since it uses less digits than its factorization.

99505779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33168596.

The product of its (nonzero) digits is 893025, while the sum is 51.

The square root of 99505779 is about 9975.2583425193. The cubic root of 99505779 is about 463.3929633012.

The spelling of 99505779 in words is "ninety-nine million, five hundred five thousand, seven hundred seventy-nine".