99842557 has 2 divisors, whose sum is σ = 99842558. Its totient is φ = 99842556.

The previous prime is 99842551. The next prime is 99842579. The reversal of 99842557 is 75524899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79673476 + 20169081 = 8926^2 + 4491^2 .

It is a cyclic number.

It is not a de Polignac number, because 99842557 - 2²³ = 91453949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 99842557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99842551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49921278 + 49921279.

It is an arithmetic number, because the mean of its divisors is an integer number (49921279).

Almost surely, 2^99842557 is an apocalyptic number.

It is an amenable number.

99842557 is a deficient number, since it is larger than the sum of its proper divisors (1).

99842557 is an equidigital number, since it uses as much as digits as its factorization.

99842557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 49.

The square root of 99842557 is about 9992.1247490211. The cubic root of 99842557 is about 463.9151601846.

The spelling of 99842557 in words is "ninety-nine million, eight hundred forty-two thousand, five hundred fifty-seven".