281630249 has 2 divisors, whose sum is σ = 281630250. Its totient is φ = 281630248.

The previous prime is 281630243. The next prime is 281630329. The reversal of 281630249 is 942036182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 273307024 + 8323225 = 16532^2 + 2885^2 .

It is a cyclic number.

It is not a de Polignac number, because 281630249 - 2²⁰ = 280581673 is a prime.

It is not a weakly prime, because it can be changed into another prime (281630243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140815124 + 140815125.

It is an arithmetic number, because the mean of its divisors is an integer number (140815125).

Almost surely, 2^281630249 is an apocalyptic number.

It is an amenable number.

281630249 is a deficient number, since it is larger than the sum of its proper divisors (1).

281630249 is an equidigital number, since it uses as much as digits as its factorization.

281630249 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 281630249 is about 16781.8428368281. The cubic root of 281630249 is about 655.4804850049.

The spelling of 281630249 in words is "two hundred eighty-one million, six hundred thirty thousand, two hundred forty-nine".