306504661 has 4 divisors (see below), whose sum is σ = 306553132. Its totient is φ = 306456192.

The previous prime is 306504631. The next prime is 306504689. The reversal of 306504661 is 166405603.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 180391761 + 126112900 = 13431^2 + 11230^2 .

It is a cyclic number.

It is not a de Polignac number, because 306504661 - 2⁵ = 306504629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306504631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13020 + ... + 27973.

It is an arithmetic number, because the mean of its divisors is an integer number (76638283).

Almost surely, 2^306504661 is an apocalyptic number.

It is an amenable number.

306504661 is a deficient number, since it is larger than the sum of its proper divisors (48471).

306504661 is an equidigital number, since it uses as much as digits as its factorization.

306504661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48470.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 306504661 is about 17507.2745166117. The cubic root of 306504661 is about 674.2366577006.

The spelling of 306504661 in words is "three hundred six million, five hundred four thousand, six hundred sixty-one".