99555511 has 4 divisors (see below), whose sum is σ = 108606024. Its totient is φ = 90505000.

The previous prime is 99555499. The next prime is 99555559. The reversal of 99555511 is 11555599.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11555599 = 11 ⋅1050509.

It is a cyclic number.

It is not a de Polignac number, because 99555511 - 2¹³ = 99547319 is a prime.

It is a super-2 number, since 2×99555511² = 19822599540942242, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99555581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4525240 + ... + 4525261.

It is an arithmetic number, because the mean of its divisors is an integer number (27151506).

Almost surely, 2^99555511 is an apocalyptic number.

99555511 is a deficient number, since it is larger than the sum of its proper divisors (9050513).

99555511 is a wasteful number, since it uses less digits than its factorization.

99555511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9050512.

The product of its digits is 50625, while the sum is 40.

The square root of 99555511 is about 9977.7507986520. The cubic root of 99555511 is about 463.4701501770.

The spelling of 99555511 in words is "ninety-nine million, five hundred fifty-five thousand, five hundred eleven".