309074197 has 4 divisors (see below), whose sum is σ = 325341280. Its totient is φ = 292807116.

The previous prime is 309074167. The next prime is 309074221. The reversal of 309074197 is 791470903.

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, and also an emirpimes, since its reverse is a distinct semiprime: 791470903 = 12149 ⋅65147.

It is a cyclic number.

It is not a de Polignac number, because 309074197 - 2¹⁹ = 308549909 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 (309074167) 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, 8133513 + ... + 8133550.

It is an arithmetic number, because the mean of its divisors is an integer number (81335320).

Almost surely, 2^309074197 is an apocalyptic number.

It is an amenable number.

309074197 is a deficient number, since it is larger than the sum of its proper divisors (16267083).

309074197 is a wasteful number, since it uses less digits than its factorization.

309074197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16267082.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 309074197 is about 17580.5061644994. The cubic root of 309074197 is about 676.1155377429.

The spelling of 309074197 in words is "three hundred nine million, seventy-four thousand, one hundred ninety-seven".