99511 has 4 divisors (see below), whose sum is σ = 100224. Its totient is φ = 98800.

The previous prime is 99497. The next prime is 99523. The reversal of 99511 is 11599.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 11599 = 7 ⋅1657.

It is a cyclic number.

It is not a de Polignac number, because 99511 - 2⁹ = 98999 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99551) by changing a digit.

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, 70 + ... + 451.

It is an arithmetic number, because the mean of its divisors is an integer number (25056).

2⁹⁹⁵¹¹ is an apocalyptic number.

99511 is a deficient number, since it is larger than the sum of its proper divisors (713).

99511 is a wasteful number, since it uses less digits than its factorization.

99511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712.

The product of its digits is 405, while the sum is 25.

The square root of 99511 is about 315.4536416021. The cubic root of 99511 is about 46.3401067796.

The spelling of 99511 in words is "ninety-nine thousand, five hundred eleven".