281381 has 2 divisors, whose sum is σ = 281382. Its totient is φ = 281380.

The previous prime is 281363. The next prime is 281419. The reversal of 281381 is 183182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188356 + 93025 = 434^2 + 305^2 .

It is a cyclic number.

It is not a de Polignac number, because 281381 - 2⁶ = 281317 is a prime.

It is a super-2 number, since 2×281381² = 158350534322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 281381.

It is not a weakly prime, because it can be changed into another prime (281321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140690 + 140691.

It is an arithmetic number, because the mean of its divisors is an integer number (140691).

2²⁸¹³⁸¹ is an apocalyptic number.

It is an amenable number.

281381 is a deficient number, since it is larger than the sum of its proper divisors (1).

281381 is an equidigital number, since it uses as much as digits as its factorization.

281381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 23.

The square root of 281381 is about 530.4535794959. The cubic root of 281381 is about 65.5287056355.

The spelling of 281381 in words is "two hundred eighty-one thousand, three hundred eighty-one".