281255649 has 16 divisors (see below), whose sum is σ = 377594880. Its totient is φ = 186215760.

The previous prime is 281255629. The next prime is 281255693. The reversal of 281255649 is 946552182.

It is not a de Polignac number, because 281255649 - 2⁵ = 281255617 is a prime.

It is a super-2 number, since 2×281255649² = 158209480188822402, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 281255649.

It is not an unprimeable number, because it can be changed into a prime (281255629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 454062 + ... + 454680.

It is an arithmetic number, because the mean of its divisors is an integer number (23599680).

Almost surely, 2^281255649 is an apocalyptic number.

It is an amenable number.

281255649 is a deficient number, since it is larger than the sum of its proper divisors (96339231).

281255649 is a wasteful number, since it uses less digits than its factorization.

281255649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420.

The product of its digits is 172800, while the sum is 42.

The square root of 281255649 is about 16770.6782510428. The cubic root of 281255649 is about 655.1897350616.

The spelling of 281255649 in words is "two hundred eighty-one million, two hundred fifty-five thousand, six hundred forty-nine".