99611961 has 4 divisors (see below), whose sum is σ = 132815952. Its totient is φ = 66407972.

The previous prime is 99611933. The next prime is 99611999. The reversal of 99611961 is 16911699.

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.

It is a cyclic number.

It is not a de Polignac number, because 99611961 - 2¹⁰ = 99610937 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99611261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16601991 + ... + 16601996.

It is an arithmetic number, because the mean of its divisors is an integer number (33203988).

Almost surely, 2^99611961 is an apocalyptic number.

It is an amenable number.

99611961 is a deficient number, since it is larger than the sum of its proper divisors (33203991).

99611961 is a wasteful number, since it uses less digits than its factorization.

99611961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33203990.

The product of its digits is 26244, while the sum is 42.

The square root of 99611961 is about 9980.5791916101. The cubic root of 99611961 is about 463.5577326266.

The spelling of 99611961 in words is "ninety-nine million, six hundred eleven thousand, nine hundred sixty-one".