99511691 has 4 divisors (see below), whose sum is σ = 99618384. Its totient is φ = 99405000.

The previous prime is 99511669. The next prime is 99511703. The reversal of 99511691 is 19611599.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99511691 - 2¹⁴ = 99495307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99511631) 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, 51935 + ... + 53816.

It is an arithmetic number, because the mean of its divisors is an integer number (24904596).

Almost surely, 2^99511691 is an apocalyptic number.

99511691 is a deficient number, since it is larger than the sum of its proper divisors (106693).

99511691 is a wasteful number, since it uses less digits than its factorization.

99511691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106692.

The product of its digits is 21870, while the sum is 41.

The square root of 99511691 is about 9975.5546712952. The cubic root of 99511691 is about 463.4021404062.

The spelling of 99511691 in words is "ninety-nine million, five hundred eleven thousand, six hundred ninety-one".