309772109 has 2 divisors, whose sum is σ = 309772110. Its totient is φ = 309772108.

The previous prime is 309772093. The next prime is 309772201. The reversal of 309772109 is 901277903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218951209 + 90820900 = 14797^2 + 9530^2 .

It is a cyclic number.

It is not a de Polignac number, because 309772109 - 2⁴ = 309772093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (309772609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154886054 + 154886055.

It is an arithmetic number, because the mean of its divisors is an integer number (154886055).

Almost surely, 2^309772109 is an apocalyptic number.

It is an amenable number.

309772109 is a deficient number, since it is larger than the sum of its proper divisors (1).

309772109 is an equidigital number, since it uses as much as digits as its factorization.

309772109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 309772109 is about 17600.3440023200. The cubic root of 309772109 is about 676.6240611816.

The spelling of 309772109 in words is "three hundred nine million, seven hundred seventy-two thousand, one hundred nine".