306630881 has 2 divisors, whose sum is σ = 306630882. Its totient is φ = 306630880.

The previous prime is 306630869. The next prime is 306630931. The reversal of 306630881 is 188036603.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219040000 + 87590881 = 14800^2 + 9359^2 .

It is an emirp because it is prime and its reverse (188036603) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 306630881 - 2⁶ = 306630817 is a prime.

It is a super-2 number, since 2×306630881² = 188044994365672322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (306630481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 153315440 + 153315441.

It is an arithmetic number, because the mean of its divisors is an integer number (153315441).

Almost surely, 2^306630881 is an apocalyptic number.

It is an amenable number.

306630881 is a deficient number, since it is larger than the sum of its proper divisors (1).

306630881 is an equidigital number, since it uses as much as digits as its factorization.

306630881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 306630881 is about 17510.8789328234. The cubic root of 306630881 is about 674.3291962301.

The spelling of 306630881 in words is "three hundred six million, six hundred thirty thousand, eight hundred eighty-one".