999306861 has 16 divisors (see below), whose sum is σ = 1523378688. Its totient is φ = 570798000.

The previous prime is 999306859. The next prime is 999306883. The reversal of 999306861 is 168603999.

It is not a de Polignac number, because 999306861 - 2¹ = 999306859 is a prime.

It is a super-2 number, since 2×999306861² = 1997228404883346642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999306811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51526 + ... + 68216.

It is an arithmetic number, because the mean of its divisors is an integer number (95211168).

Almost surely, 2^999306861 is an apocalyptic number.

It is an amenable number.

999306861 is a deficient number, since it is larger than the sum of its proper divisors (524071827).

999306861 is a wasteful number, since it uses less digits than its factorization.

999306861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19552.

The product of its (nonzero) digits is 629856, while the sum is 51.

The square root of 999306861 is about 31611.8152120374. The cubic root of 999306861 is about 999.7689002637.

The spelling of 999306861 in words is "nine hundred ninety-nine million, three hundred six thousand, eight hundred sixty-one".