99999553 has 4 divisors (see below), whose sum is σ = 102325168. Its totient is φ = 97673940.

The previous prime is 99999551. The next prime is 99999563. The reversal of 99999553 is 35599999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35599999 = 4691 ⋅7589.

It is a cyclic number.

It is not a de Polignac number, because 99999553 - 2¹ = 99999551 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99999551) 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 in 3 ways as a sum of consecutive naturals, for example, 1162743 + ... + 1162828.

It is an arithmetic number, because the mean of its divisors is an integer number (25581292).

Almost surely, 2^99999553 is an apocalyptic number.

It is an amenable number.

99999553 is a deficient number, since it is larger than the sum of its proper divisors (2325615).

99999553 is a wasteful number, since it uses less digits than its factorization.

99999553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2325614.

The product of its digits is 4428675, while the sum is 58.

The square root of 99999553 is about 9999.9776499750. The cubic root of 99999553 is about 464.1581917635.

The spelling of 99999553 in words is "ninety-nine million, nine hundred ninety-nine thousand, five hundred fifty-three".