281746081 has 2 divisors, whose sum is σ = 281746082. Its totient is φ = 281746080.

The previous prime is 281746043. The next prime is 281746099. The reversal of 281746081 is 180647182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230766481 + 50979600 = 15191^2 + 7140^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-281746081 is a prime.

It is a super-2 number, since 2×281746081² = 158761708317717122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 281746081.

It is not a weakly prime, because it can be changed into another prime (281746001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140873040 + 140873041.

It is an arithmetic number, because the mean of its divisors is an integer number (140873041).

Almost surely, 2^281746081 is an apocalyptic number.

It is an amenable number.

281746081 is a deficient number, since it is larger than the sum of its proper divisors (1).

281746081 is an equidigital number, since it uses as much as digits as its factorization.

281746081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 281746081 is about 16785.2935929045. The cubic root of 281746081 is about 655.5703371059.

The spelling of 281746081 in words is "two hundred eighty-one million, seven hundred forty-six thousand, eighty-one".