309120913 has 8 divisors (see below), whose sum is σ = 311630400. Its totient is φ = 306617520.

The previous prime is 309120907. The next prime is 309120919. The reversal of 309120913 is 319021903.

It is an interprime number because it is at equal distance from previous prime (309120907) and next prime (309120919).

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 309120913 - 2⁵ = 309120881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309120919) 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, 191556 + ... + 193162.

It is an arithmetic number, because the mean of its divisors is an integer number (38953800).

Almost surely, 2^309120913 is an apocalyptic number.

It is an amenable number.

309120913 is a deficient number, since it is larger than the sum of its proper divisors (2509487).

309120913 is a wasteful number, since it uses less digits than its factorization.

309120913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3047.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 309120913 is about 17581.8347449861. The cubic root of 309120913 is about 676.1496005694.

The spelling of 309120913 in words is "three hundred nine million, one hundred twenty thousand, nine hundred thirteen".