309147121 has 2 divisors, whose sum is σ = 309147122. Its totient is φ = 309147120.

The previous prime is 309147103. The next prime is 309147127. The reversal of 309147121 is 121741903.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 278222400 + 30924721 = 16680^2 + 5561^2 .

It is a cyclic number.

It is not a de Polignac number, because 309147121 - 2⁵ = 309147089 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 309147121.

It is not a weakly prime, because it can be changed into another prime (309147127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154573560 + 154573561.

It is an arithmetic number, because the mean of its divisors is an integer number (154573561).

Almost surely, 2^309147121 is an apocalyptic number.

It is an amenable number.

309147121 is a deficient number, since it is larger than the sum of its proper divisors (1).

309147121 is an equidigital number, since it uses as much as digits as its factorization.

309147121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 309147121 is about 17582.5800438957. The cubic root of 309147121 is about 676.1687085486.

The spelling of 309147121 in words is "three hundred nine million, one hundred forty-seven thousand, one hundred twenty-one".