281651 has 2 divisors, whose sum is σ = 281652. Its totient is φ = 281650.

The previous prime is 281647. The next prime is 281653. The reversal of 281651 is 156182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 281651 - 2² = 281647 is a prime.

Together with 281653, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 2¹⁰ + 8² + 6⁷ + 1 + 5⁴ + 1 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 281651.

It is not a weakly prime, because it can be changed into another prime (281653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140825 + 140826.

It is an arithmetic number, because the mean of its divisors is an integer number (140826).

2²⁸¹⁶⁵¹ is an apocalyptic number.

281651 is a deficient number, since it is larger than the sum of its proper divisors (1).

281651 is an equidigital number, since it uses as much as digits as its factorization.

281651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 23.

The square root of 281651 is about 530.7080176519. The cubic root of 281651 is about 65.5496583585.

The spelling of 281651 in words is "two hundred eighty-one thousand, six hundred fifty-one".