99557 has 4 divisors (see below), whose sum is σ = 103020. Its totient is φ = 96096.

The previous prime is 99551. The next prime is 99559. The reversal of 99557 is 75599.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75599 = 17 ⋅4447.

It can be written as a sum of positive squares in 2 ways, for example, as 42436 + 57121 = 206^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 99557 - 2¹⁰ = 98533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 99557.

It is not an unprimeable number, because it can be changed into a prime (99551) 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, 1688 + ... + 1745.

It is an arithmetic number, because the mean of its divisors is an integer number (25755).

2⁹⁹⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

99557 is a deficient number, since it is larger than the sum of its proper divisors (3463).

99557 is a wasteful number, since it uses less digits than its factorization.

99557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3462.

The product of its digits is 14175, while the sum is 35.

The square root of 99557 is about 315.5265440498. The cubic root of 99557 is about 46.3472460793.

It can be divided in two parts, 99 and 557, that added together give a palindrome (656).

The spelling of 99557 in words is "ninety-nine thousand, five hundred fifty-seven".