99977209 has 2 divisors, whose sum is σ = 99977210. Its totient is φ = 99977208.

The previous prime is 99977197. The next prime is 99977233. The reversal of 99977209 is 90277999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84548025 + 15429184 = 9195^2 + 3928^2 .

It is a cyclic number.

It is not a de Polignac number, because 99977209 - 2⁵ = 99977177 is a prime.

It is not a weakly prime, because it can be changed into another prime (99977249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49988604 + 49988605.

It is an arithmetic number, because the mean of its divisors is an integer number (49988605).

Almost surely, 2^99977209 is an apocalyptic number.

It is an amenable number.

99977209 is a deficient number, since it is larger than the sum of its proper divisors (1).

99977209 is an equidigital number, since it uses as much as digits as its factorization.

99977209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 642978, while the sum is 52.

The square root of 99977209 is about 9998.8603850639. The cubic root of 99977209 is about 464.1236185317.

The spelling of 99977209 in words is "ninety-nine million, nine hundred seventy-seven thousand, two hundred nine".