305881421 has 2 divisors, whose sum is σ = 305881422. Its totient is φ = 305881420.

The previous prime is 305881417. The next prime is 305881453. The reversal of 305881421 is 124188503.

It is an a-pointer prime, because the next prime (305881453) can be obtained adding 305881421 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 297390025 + 8491396 = 17245^2 + 2914^2 .

It is a cyclic number.

It is not a de Polignac number, because 305881421 - 2² = 305881417 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305881021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152940710 + 152940711.

It is an arithmetic number, because the mean of its divisors is an integer number (152940711).

Almost surely, 2^305881421 is an apocalyptic number.

It is an amenable number.

305881421 is a deficient number, since it is larger than the sum of its proper divisors (1).

305881421 is an equidigital number, since it uses as much as digits as its factorization.

305881421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 305881421 is about 17489.4660009961. The cubic root of 305881421 is about 673.7793548203.

The spelling of 305881421 in words is "three hundred five million, eight hundred eighty-one thousand, four hundred twenty-one".