305390381 has 2 divisors, whose sum is σ = 305390382. Its totient is φ = 305390380.

The previous prime is 305390377. The next prime is 305390413. The reversal of 305390381 is 183093503.

It is an a-pointer prime, because the next prime (305390413) can be obtained adding 305390381 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., 262278025 + 43112356 = 16195^2 + 6566^2 .

It is a cyclic number.

It is not a de Polignac number, because 305390381 - 2² = 305390377 is a prime.

It is a super-2 number, since 2×305390381² = 186526569614650322, which contains 22 as substring.

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 (305390311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152695190 + 152695191.

It is an arithmetic number, because the mean of its divisors is an integer number (152695191).

Almost surely, 2^305390381 is an apocalyptic number.

It is an amenable number.

305390381 is a deficient number, since it is larger than the sum of its proper divisors (1).

305390381 is an equidigital number, since it uses as much as digits as its factorization.

305390381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 305390381 is about 17475.4221980472. The cubic root of 305390381 is about 673.4186161026.

The spelling of 305390381 in words is "three hundred five million, three hundred ninety thousand, three hundred eighty-one".