281149231 has 4 divisors (see below), whose sum is σ = 306708264. Its totient is φ = 255590200.

The previous prime is 281149201. The next prime is 281149237. The reversal of 281149231 is 132941182.

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 281149231 - 2¹¹ = 281147183 is a prime.

It is a super-2 number, since 2×281149231² = 158089780183782722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 281149193 and 281149202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281149237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12779500 + ... + 12779521.

It is an arithmetic number, because the mean of its divisors is an integer number (76677066).

Almost surely, 2^281149231 is an apocalyptic number.

281149231 is a deficient number, since it is larger than the sum of its proper divisors (25559033).

281149231 is a wasteful number, since it uses less digits than its factorization.

281149231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25559032.

The product of its digits is 3456, while the sum is 31.

The square root of 281149231 is about 16767.5052109728. The cubic root of 281149231 is about 655.1070904675.

The spelling of 281149231 in words is "two hundred eighty-one million, one hundred forty-nine thousand, two hundred thirty-one".