99542257 has 2 divisors, whose sum is σ = 99542258. Its totient is φ = 99542256.

The previous prime is 99542243. The next prime is 99542269. The reversal of 99542257 is 75224599.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61089856 + 38452401 = 7816^2 + 6201^2 .

It is an emirp because it is prime and its reverse (75224599) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99542257 - 2¹⁵ = 99509489 is a prime.

It is not a weakly prime, because it can be changed into another prime (99542357) 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, 49771128 + 49771129.

It is an arithmetic number, because the mean of its divisors is an integer number (49771129).

Almost surely, 2^99542257 is an apocalyptic number.

It is an amenable number.

99542257 is a deficient number, since it is larger than the sum of its proper divisors (1).

99542257 is an equidigital number, since it uses as much as digits as its factorization.

99542257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 43.

The square root of 99542257 is about 9977.0865988023. The cubic root of 99542257 is about 463.4495817325.

It can be divided in two parts, 99542 and 257, that added together give a palindrome (99799).

The spelling of 99542257 in words is "ninety-nine million, five hundred forty-two thousand, two hundred fifty-seven".