281878361 has 2 divisors, whose sum is σ = 281878362. Its totient is φ = 281878360.

The previous prime is 281878351. The next prime is 281878369. The reversal of 281878361 is 163878182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159643225 + 122235136 = 12635^2 + 11056^2 .

It is a cyclic number.

It is not a de Polignac number, because 281878361 - 2⁶ = 281878297 is a prime.

It is not a weakly prime, because it can be changed into another prime (281878369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140939180 + 140939181.

It is an arithmetic number, because the mean of its divisors is an integer number (140939181).

Almost surely, 2^281878361 is an apocalyptic number.

It is an amenable number.

281878361 is a deficient number, since it is larger than the sum of its proper divisors (1).

281878361 is an equidigital number, since it uses as much as digits as its factorization.

281878361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 44.

The square root of 281878361 is about 16789.2334845877. The cubic root of 281878361 is about 655.6729179782.

The spelling of 281878361 in words is "two hundred eighty-one million, eight hundred seventy-eight thousand, three hundred sixty-one".