281681461 has 2 divisors, whose sum is σ = 281681462. Its totient is φ = 281681460.

The previous prime is 281681447. The next prime is 281681473. The reversal of 281681461 is 164186182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204347025 + 77334436 = 14295^2 + 8794^2 .

It is a cyclic number.

It is not a de Polignac number, because 281681461 - 2¹³ = 281673269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 281681461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (281681401) 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, 140840730 + 140840731.

It is an arithmetic number, because the mean of its divisors is an integer number (140840731).

Almost surely, 2^281681461 is an apocalyptic number.

It is an amenable number.

281681461 is a deficient number, since it is larger than the sum of its proper divisors (1).

281681461 is an equidigital number, since it uses as much as digits as its factorization.

281681461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 37.

The square root of 281681461 is about 16783.3685832136. The cubic root of 281681461 is about 655.5202137299.

The spelling of 281681461 in words is "two hundred eighty-one million, six hundred eighty-one thousand, four hundred sixty-one".