281731139 has 2 divisors, whose sum is σ = 281731140. Its totient is φ = 281731138.

The previous prime is 281731129. The next prime is 281731147. The reversal of 281731139 is 931137182.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-281731139 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 281731099 and 281731108.

It is not a weakly prime, because it can be changed into another prime (281731129) 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 as a sum of consecutive naturals, namely, 140865569 + 140865570.

It is an arithmetic number, because the mean of its divisors is an integer number (140865570).

Almost surely, 2^281731139 is an apocalyptic number.

281731139 is a deficient number, since it is larger than the sum of its proper divisors (1).

281731139 is an equidigital number, since it uses as much as digits as its factorization.

281731139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 35.

The square root of 281731139 is about 16784.8484949969. The cubic root of 281731139 is about 655.5587478230.

The spelling of 281731139 in words is "two hundred eighty-one million, seven hundred thirty-one thousand, one hundred thirty-nine".