99770009 has 4 divisors (see below), whose sum is σ = 101652516. Its totient is φ = 97887504.

The previous prime is 99769963. The next prime is 99770017. The reversal of 99770009 is 90007799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90007799 = 7 ⋅12858257.

It can be written as a sum of positive squares in 2 ways, for example, as 56670784 + 43099225 = 7528^2 + 6565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99770009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99770089) 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, 941174 + ... + 941279.

It is an arithmetic number, because the mean of its divisors is an integer number (25413129).

Almost surely, 2^99770009 is an apocalyptic number.

It is an amenable number.

99770009 is a deficient number, since it is larger than the sum of its proper divisors (1882507).

99770009 is a wasteful number, since it uses less digits than its factorization.

99770009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1882506.

The product of its (nonzero) digits is 35721, while the sum is 41.

The square root of 99770009 is about 9988.4938304031. The cubic root of 99770009 is about 463.8027689921.

The spelling of 99770009 in words is "ninety-nine million, seven hundred seventy thousand, nine".