308056121 has 2 divisors, whose sum is σ = 308056122. Its totient is φ = 308056120.

The previous prime is 308056097. The next prime is 308056123. The reversal of 308056121 is 121650803.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 259210000 + 48846121 = 16100^2 + 6989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-308056121 is a prime.

It is a Sophie Germain prime.

Together with 308056123, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (308056123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154028060 + 154028061.

It is an arithmetic number, because the mean of its divisors is an integer number (154028061).

Almost surely, 2^308056121 is an apocalyptic number.

It is an amenable number.

308056121 is a deficient number, since it is larger than the sum of its proper divisors (1).

308056121 is an equidigital number, since it uses as much as digits as its factorization.

308056121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 308056121 is about 17551.5275973347. The cubic root of 308056121 is about 675.3723567868.

The spelling of 308056121 in words is "three hundred eight million, fifty-six thousand, one hundred twenty-one".