309414649 has 2 divisors, whose sum is σ = 309414650. Its totient is φ = 309414648.

The previous prime is 309414647. The next prime is 309414667. The reversal of 309414649 is 946414903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 308248249 + 1166400 = 17557^2 + 1080^2 .

It is a cyclic number.

It is not a de Polignac number, because 309414649 - 2¹ = 309414647 is a prime.

Together with 309414647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (309414647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154707324 + 154707325.

It is an arithmetic number, because the mean of its divisors is an integer number (154707325).

Almost surely, 2^309414649 is an apocalyptic number.

It is an amenable number.

309414649 is a deficient number, since it is larger than the sum of its proper divisors (1).

309414649 is an equidigital number, since it uses as much as digits as its factorization.

309414649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 309414649 is about 17590.1861559223. The cubic root of 309414649 is about 676.3636986732.

The spelling of 309414649 in words is "three hundred nine million, four hundred fourteen thousand, six hundred forty-nine".