309445901 has 8 divisors (see below), whose sum is σ = 319019064. Its totient is φ = 299969280.

The previous prime is 309445897. The next prime is 309445909. The reversal of 309445901 is 109544903.

It can be written as a sum of positive squares in 4 ways, for example, as 7590025 + 301855876 = 2755^2 + 17374^2 .

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 309445901 - 2² = 309445897 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 (309445909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17600 + ... + 30473.

It is an arithmetic number, because the mean of its divisors is an integer number (39877383).

Almost surely, 2^309445901 is an apocalyptic number.

It is an amenable number.

309445901 is a deficient number, since it is larger than the sum of its proper divisors (9573163).

309445901 is a wasteful number, since it uses less digits than its factorization.

309445901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48271.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 309445901 is about 17591.0744697418. The cubic root of 309445901 is about 676.3864696342.

The spelling of 309445901 in words is "three hundred nine million, four hundred forty-five thousand, nine hundred one".