999242251 has 24 divisors (see below), whose sum is σ = 1203628416. Its totient is φ = 826277760.

The previous prime is 999242207. The next prime is 999242263. The reversal of 999242251 is 152242999.

It is not a de Polignac number, because 999242251 - 2²⁹ = 462371339 is a prime.

It is a super-3 number, since 3×999242251³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 999242198 and 999242207.

It is not an unprimeable number, because it can be changed into a prime (999242351) 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 23 ways as a sum of consecutive naturals, for example, 602215 + ... + 603871.

It is an arithmetic number, because the mean of its divisors is an integer number (50151184).

Almost surely, 2^999242251 is an apocalyptic number.

999242251 is the 18251-st hex number.

999242251 is a deficient number, since it is larger than the sum of its proper divisors (204386165).

999242251 is a wasteful number, since it uses less digits than its factorization.

999242251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099 (or 2092 counting only the distinct ones).

The product of its digits is 116640, while the sum is 43.

The square root of 999242251 is about 31610.7932674901. The cubic root of 999242251 is about 999.7473531750.

The spelling of 999242251 in words is "nine hundred ninety-nine million, two hundred forty-two thousand, two hundred fifty-one".