304981 has 2 divisors, whose sum is σ = 304982. Its totient is φ = 304980.

The previous prime is 304979. The next prime is 305017. The reversal of 304981 is 189403.

304981 = 390² + 391².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152881 + 152100 = 391^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 304981 - 2¹ = 304979 is a prime.

It is a super-2 number, since 2×304981² = 186026820722, which contains 22 as substring.

Together with 304979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (304901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152490 + 152491.

It is an arithmetic number, because the mean of its divisors is an integer number (152491).

2³⁰⁴⁹⁸¹ is an apocalyptic number.

304981 is the 391-st centered square number.

It is an amenable number.

304981 is a deficient number, since it is larger than the sum of its proper divisors (1).

304981 is an equidigital number, since it uses as much as digits as its factorization.

304981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 304981 is about 552.2508487997. The cubic root of 304981 is about 67.3117571841.

The spelling of 304981 in words is "three hundred four thousand, nine hundred eighty-one".