91442999 has 4 divisors (see below), whose sum is σ = 91486080. Its totient is φ = 91399920.

The previous prime is 91442987. The next prime is 91443031. The reversal of 91442999 is 99924419.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91442999 is a prime.

It is a super-2 number, since 2×91442999² = 16723644132228002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91442909) 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, 18182 + ... + 22659.

It is an arithmetic number, because the mean of its divisors is an integer number (22871520).

Almost surely, 2^91442999 is an apocalyptic number.

91442999 is a deficient number, since it is larger than the sum of its proper divisors (43081).

91442999 is a wasteful number, since it uses less digits than its factorization.

91442999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43080.

The product of its digits is 209952, while the sum is 47.

The square root of 91442999 is about 9562.5832806831. The cubic root of 91442999 is about 450.5228474211.

The spelling of 91442999 in words is "ninety-one million, four hundred forty-two thousand, nine hundred ninety-nine".