281381131 has 4 divisors (see below), whose sum is σ = 281523064. Its totient is φ = 281239200.

The previous prime is 281381123. The next prime is 281381137. The reversal of 281381131 is 131183182.

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

It is a cyclic number.

It is not a de Polignac number, because 281381131 - 2³ = 281381123 is a prime.

It is a super-2 number, since 2×281381131² = 158350681765678322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 281381131.

It is not an unprimeable number, because it can be changed into a prime (281381137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67950 + ... + 71971.

It is an arithmetic number, because the mean of its divisors is an integer number (70380766).

Almost surely, 2^281381131 is an apocalyptic number.

281381131 is a deficient number, since it is larger than the sum of its proper divisors (141933).

281381131 is a wasteful number, since it uses less digits than its factorization.

281381131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141932.

The product of its digits is 1152, while the sum is 28.

The square root of 281381131 is about 16774.4189467176. The cubic root of 281381131 is about 655.2871580467.

The spelling of 281381131 in words is "two hundred eighty-one million, three hundred eighty-one thousand, one hundred thirty-one".