309997311 has 16 divisors (see below), whose sum is σ = 446831616. Its totient is φ = 190035936.

The previous prime is 309997291. The next prime is 309997319. The reversal of 309997311 is 113799903.

It is not a de Polignac number, because 309997311 - 2⁷ = 309997183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309997319) 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, 4855 + ... + 25368.

It is an arithmetic number, because the mean of its divisors is an integer number (27926976).

Almost surely, 2^309997311 is an apocalyptic number.

309997311 is a deficient number, since it is larger than the sum of its proper divisors (136834305).

309997311 is a wasteful number, since it uses less digits than its factorization.

309997311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30502.

The product of its (nonzero) digits is 45927, while the sum is 42.

The square root of 309997311 is about 17606.7404990248. The cubic root of 309997311 is about 676.7879883361.

The spelling of 309997311 in words is "three hundred nine million, nine hundred ninety-seven thousand, three hundred eleven".