999042502091 has 2 divisors, whose sum is σ = 999042502092. Its totient is φ = 999042502090.

The previous prime is 999042502063. The next prime is 999042502151. The reversal of 999042502091 is 190205240999.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999042502091 is a prime.

It is not a weakly prime, because it can be changed into another prime (999044502091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499521251045 + 499521251046.

It is an arithmetic number, because the mean of its divisors is an integer number (499521251046).

Almost surely, 2^999042502091 is an apocalyptic number.

999042502091 is a deficient number, since it is larger than the sum of its proper divisors (1).

999042502091 is an equidigital number, since it uses as much as digits as its factorization.

999042502091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 524880, while the sum is 50.

The spelling of 999042502091 in words is "nine hundred ninety-nine billion, forty-two million, five hundred two thousand, ninety-one".