999918240133 has 4 divisors (see below), whose sum is σ = 999920549440. Its totient is φ = 999915930828.

The previous prime is 999918240091. The next prime is 999918240173. The reversal of 999918240133 is 331042819999.

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 3-Lehmer number, since φ(999918240133) divides (999918240133-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999918240133 is a prime.

It is a deceptive number, since it divides R_999918240132.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999918240173) 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, 288663 + ... + 1443316.

It is an arithmetic number, because the mean of its divisors is an integer number (249980137360).

Almost surely, 2^999918240133 is an apocalyptic number.

999918240133 is the 577327-th octagonal number.

It is an amenable number.

999918240133 is a deficient number, since it is larger than the sum of its proper divisors (2309307).

999918240133 is a wasteful number, since it uses less digits than its factorization.

999918240133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2309306.

The product of its (nonzero) digits is 3779136, while the sum is 58.

The spelling of 999918240133 in words is "nine hundred ninety-nine billion, nine hundred eighteen million, two hundred forty thousand, one hundred thirty-three".