281197897 has 2 divisors, whose sum is σ = 281197898. Its totient is φ = 281197896.

The previous prime is 281197877. The next prime is 281197909. The reversal of 281197897 is 798791182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 264355081 + 16842816 = 16259^2 + 4104^2 .

It is a cyclic number.

It is not a de Polignac number, because 281197897 - 2¹⁹ = 280673609 is a prime.

It is not a weakly prime, because it can be changed into another prime (281197877) 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, 140598948 + 140598949.

It is an arithmetic number, because the mean of its divisors is an integer number (140598949).

Almost surely, 2^281197897 is an apocalyptic number.

It is an amenable number.

281197897 is a deficient number, since it is larger than the sum of its proper divisors (1).

281197897 is an equidigital number, since it uses as much as digits as its factorization.

281197897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 52.

The square root of 281197897 is about 16768.9563479663. The cubic root of 281197897 is about 655.1448872421.

The spelling of 281197897 in words is "two hundred eighty-one million, one hundred ninety-seven thousand, eight hundred ninety-seven".