281481981 has 32 divisors (see below), whose sum is σ = 430507008. Its totient is φ = 161927040.

The previous prime is 281481947. The next prime is 281481997. The reversal of 281481981 is 189184182.

It is not a de Polignac number, because 281481981 - 2²¹ = 279384829 is a prime.

It is a super-2 number, since 2×281481981² = 158464211255368722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281481901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102630 + ... + 105336.

It is an arithmetic number, because the mean of its divisors is an integer number (13453344).

Almost surely, 2^281481981 is an apocalyptic number.

It is an amenable number.

281481981 is a deficient number, since it is larger than the sum of its proper divisors (149025027).

281481981 is a wasteful number, since it uses less digits than its factorization.

281481981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2881.

The product of its digits is 36864, while the sum is 42.

The square root of 281481981 is about 16777.4247427905. The cubic root of 281481981 is about 655.3654359989.

The spelling of 281481981 in words is "two hundred eighty-one million, four hundred eighty-one thousand, nine hundred eighty-one".