309070997 has 8 divisors (see below), whose sum is σ = 316968792. Its totient is φ = 301190400.

The previous prime is 309070991. The next prime is 309071017. The reversal of 309070997 is 799070903.

It can be written as a sum of positive squares in 4 ways, for example, as 9296401 + 299774596 = 3049^2 + 17314^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 309070997 - 2⁴ = 309070981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309070991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37097 + ... + 44657.

It is an arithmetic number, because the mean of its divisors is an integer number (39621099).

Almost surely, 2^309070997 is an apocalyptic number.

It is an amenable number.

309070997 is a deficient number, since it is larger than the sum of its proper divisors (7897795).

309070997 is an equidigital number, since it uses as much as digits as its factorization.

309070997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8599.

The product of its (nonzero) digits is 107163, while the sum is 44.

The square root of 309070997 is about 17580.4151543699. The cubic root of 309070997 is about 676.1132043472.

The spelling of 309070997 in words is "three hundred nine million, seventy thousand, nine hundred ninety-seven".