281631797 has 2 divisors, whose sum is σ = 281631798. Its totient is φ = 281631796.

The previous prime is 281631787. The next prime is 281631799. The reversal of 281631797 is 797136182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243796996 + 37834801 = 15614^2 + 6151^2 .

It is a cyclic number.

It is not a de Polignac number, because 281631797 - 2⁸ = 281631541 is a prime.

Together with 281631799, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281631799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140815898 + 140815899.

It is an arithmetic number, because the mean of its divisors is an integer number (140815899).

Almost surely, 2^281631797 is an apocalyptic number.

It is an amenable number.

281631797 is a deficient number, since it is larger than the sum of its proper divisors (1).

281631797 is an equidigital number, since it uses as much as digits as its factorization.

281631797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 44.

The square root of 281631797 is about 16781.8889580405. Note that the first 3 decimals coincide. The cubic root of 281631797 is about 655.4816859672.

The spelling of 281631797 in words is "two hundred eighty-one million, six hundred thirty-one thousand, seven hundred ninety-seven".