304131681 has 18 divisors (see below), whose sum is σ = 511024722. Its totient is φ = 173789280.

The previous prime is 304131679. The next prime is 304131697. The reversal of 304131681 is 186131403.

It can be written as a sum of positive squares in only one way, i.e., 285779025 + 18352656 = 16905^2 + 4284^2 .

It is not a de Polignac number, because 304131681 - 2¹ = 304131679 is a prime.

It is a super-2 number, since 2×304131681² = 184992158775771522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (304131631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 344380 + ... + 345261.

Almost surely, 2^304131681 is an apocalyptic number.

It is an amenable number.

304131681 is a deficient number, since it is larger than the sum of its proper divisors (206893041).

304131681 is a wasteful number, since it uses less digits than its factorization.

304131681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689661 (or 689651 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 304131681 is about 17439.3715769806. The cubic root of 304131681 is about 672.4921524952.

The spelling of 304131681 in words is "three hundred four million, one hundred thirty-one thousand, six hundred eighty-one".