308361421 has 2 divisors, whose sum is σ = 308361422. Its totient is φ = 308361420.

The previous prime is 308361401. The next prime is 308361439. The reversal of 308361421 is 124163803.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 287302500 + 21058921 = 16950^2 + 4589^2 .

It is a cyclic number.

It is not a de Polignac number, because 308361421 - 2¹⁵ = 308328653 is a prime.

It is a super-2 number, since 2×308361421² = 190173531922278482, which contains 22 as substring.

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 308361421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (308361401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154180710 + 154180711.

It is an arithmetic number, because the mean of its divisors is an integer number (154180711).

Almost surely, 2^308361421 is an apocalyptic number.

It is an amenable number.

308361421 is a deficient number, since it is larger than the sum of its proper divisors (1).

308361421 is an equidigital number, since it uses as much as digits as its factorization.

308361421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 308361421 is about 17560.2226922098. Note that the first 3 decimals coincide. The cubic root of 308361421 is about 675.5953930979.

The spelling of 308361421 in words is "three hundred eight million, three hundred sixty-one thousand, four hundred twenty-one".