281560649 has 2 divisors, whose sum is σ = 281560650. Its totient is φ = 281560648.

The previous prime is 281560637. The next prime is 281560673. The reversal of 281560649 is 946065182.

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 + 62520649 = 14800^2 + 7907^2 .

It is a cyclic number.

It is not a de Polignac number, because 281560649 - 2⁴ = 281560633 is a prime.

It is not a weakly prime, because it can be changed into another prime (281560679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140780324 + 140780325.

It is an arithmetic number, because the mean of its divisors is an integer number (140780325).

Almost surely, 2^281560649 is an apocalyptic number.

It is an amenable number.

281560649 is a deficient number, since it is larger than the sum of its proper divisors (1).

281560649 is an equidigital number, since it uses as much as digits as its factorization.

281560649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 281560649 is about 16779.7690389350. The cubic root of 281560649 is about 655.4264837028.

The spelling of 281560649 in words is "two hundred eighty-one million, five hundred sixty thousand, six hundred forty-nine".