99559997 has 2 divisors, whose sum is σ = 99559998. Its totient is φ = 99559996.

The previous prime is 99559961. The next prime is 99560009. The reversal of 99559997 is 79995599.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85914361 + 13645636 = 9269^2 + 3694^2 .

It is an emirp because it is prime and its reverse (79995599) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99559997 - 2⁸ = 99559741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99559937) 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 as a sum of consecutive naturals, namely, 49779998 + 49779999.

It is an arithmetic number, because the mean of its divisors is an integer number (49779999).

Almost surely, 2^99559997 is an apocalyptic number.

It is an amenable number.

99559997 is a deficient number, since it is larger than the sum of its proper divisors (1).

99559997 is an equidigital number, since it uses as much as digits as its factorization.

99559997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10333575, while the sum is 62.

The square root of 99559997 is about 9977.9755962820. The cubic root of 99559997 is about 463.4771114386.

The spelling of 99559997 in words is "ninety-nine million, five hundred fifty-nine thousand, nine hundred ninety-seven".