281381137 has 2 divisors, whose sum is σ = 281381138. Its totient is φ = 281381136.

The previous prime is 281381123. The next prime is 281381143. The reversal of 281381137 is 731183182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167340096 + 114041041 = 12936^2 + 10679^2 .

It is a cyclic number.

It is not a de Polignac number, because 281381137 - 2¹¹ = 281379089 is a prime.

It is not a weakly prime, because it can be changed into another prime (281381117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140690568 + 140690569.

It is an arithmetic number, because the mean of its divisors is an integer number (140690569).

Almost surely, 2^281381137 is an apocalyptic number.

It is an amenable number.

281381137 is a deficient number, since it is larger than the sum of its proper divisors (1).

281381137 is an equidigital number, since it uses as much as digits as its factorization.

281381137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 34.

The square root of 281381137 is about 16774.4191255614. The cubic root of 281381137 is about 655.2871627043.

The spelling of 281381137 in words is "two hundred eighty-one million, three hundred eighty-one thousand, one hundred thirty-seven".