309168949 has 4 divisors (see below), whose sum is σ = 313082560. Its totient is φ = 305255340.

The previous prime is 309168917. The next prime is 309168989. The reversal of 309168949 is 949861903.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 309168949 - 2⁵ = 309168917 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 (309168989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1956687 + ... + 1956844.

It is an arithmetic number, because the mean of its divisors is an integer number (78270640).

Almost surely, 2^309168949 is an apocalyptic number.

It is an amenable number.

309168949 is a deficient number, since it is larger than the sum of its proper divisors (3913611).

309168949 is an equidigital number, since it uses as much as digits as its factorization.

309168949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3913610.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 309168949 is about 17583.2007609536. The cubic root of 309168949 is about 676.1846222913.

The spelling of 309168949 in words is "three hundred nine million, one hundred sixty-eight thousand, nine hundred forty-nine".