99779101 has 4 divisors (see below), whose sum is σ = 101146012. Its totient is φ = 98412192.

The previous prime is 99779081. The next prime is 99779131. The reversal of 99779101 is 10197799.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26265625 + 73513476 = 5125^2 + 8574^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99779101 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 (99779131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 683346 + ... + 683491.

It is an arithmetic number, because the mean of its divisors is an integer number (25286503).

Almost surely, 2^99779101 is an apocalyptic number.

It is an amenable number.

99779101 is a deficient number, since it is larger than the sum of its proper divisors (1366911).

99779101 is a wasteful number, since it uses less digits than its factorization.

99779101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366910.

The product of its (nonzero) digits is 35721, while the sum is 43.

The square root of 99779101 is about 9988.9489437077. The cubic root of 99779101 is about 463.8168572829.

The spelling of 99779101 in words is "ninety-nine million, seven hundred seventy-nine thousand, one hundred one".