281081081 has 4 divisors (see below), whose sum is σ = 283864164. Its totient is φ = 278298000.

The previous prime is 281081069. The next prime is 281081093. The reversal of 281081081 is 180180182.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (281081069) and next prime (281081093).

It can be written as a sum of positive squares in 2 ways, for example, as 227557225 + 53523856 = 15085^2 + 7316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-281081081 is a prime.

It is a super-2 number, since 2×281081081² = 158013148192257122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (281081011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1391390 + ... + 1391591.

It is an arithmetic number, because the mean of its divisors is an integer number (70966041).

Almost surely, 2^281081081 is an apocalyptic number.

It is an amenable number.

281081081 is a deficient number, since it is larger than the sum of its proper divisors (2783083).

281081081 is a wasteful number, since it uses less digits than its factorization.

281081081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2783082.

The product of its (nonzero) digits is 1024, while the sum is 29.

The square root of 281081081 is about 16765.4728832801. The cubic root of 281081081 is about 655.0541539826.

The spelling of 281081081 in words is "two hundred eighty-one million, eighty-one thousand, eighty-one".