999391051 has 16 divisors (see below), whose sum is σ = 1088051200. Its totient is φ = 914457600.

The previous prime is 999391049. The next prime is 999391073. The reversal of 999391051 is 150193999.

It is a 10-Lehmer number, since φ(999391051) divides (999391051-1)¹⁰.

It is a cyclic number.

It is not a de Polignac number, because 999391051 - 2¹ = 999391049 is a prime.

It is a deceptive number, since it divides R_999391050.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 999390992 and 999391010.

It is not an unprimeable number, because it can be changed into a prime (999391451) 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 15 ways as a sum of consecutive naturals, for example, 370315 + ... + 373003.

It is an arithmetic number, because the mean of its divisors is an integer number (68003200).

Almost surely, 2^999391051 is an apocalyptic number.

999391051 is a deficient number, since it is larger than the sum of its proper divisors (88660149).

999391051 is a wasteful number, since it uses less digits than its factorization.

999391051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3370.

The product of its (nonzero) digits is 98415, while the sum is 46.

The square root of 999391051 is about 31613.1468063526. The cubic root of 999391051 is about 999.7969757840.

The spelling of 999391051 in words is "nine hundred ninety-nine million, three hundred ninety-one thousand, fifty-one".