18071232281 has 2 divisors, whose sum is σ = 18071232282. Its totient is φ = 18071232280.

The previous prime is 18071232251. The next prime is 18071232299. The reversal of 18071232281 is 18223217081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17939923600 + 131308681 = 133940^2 + 11459^2 .

It is a cyclic number.

It is not a de Polignac number, because 18071232281 - 2¹⁰ = 18071231257 is a prime.

It is a super-2 number, since 2×18071232281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18071232251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9035616140 + 9035616141.

It is an arithmetic number, because the mean of its divisors is an integer number (9035616141).

Almost surely, 2^18071232281 is an apocalyptic number.

It is an amenable number.

18071232281 is a deficient number, since it is larger than the sum of its proper divisors (1).

18071232281 is an equidigital number, since it uses as much as digits as its factorization.

18071232281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 35.

The spelling of 18071232281 in words is "eighteen billion, seventy-one million, two hundred thirty-two thousand, two hundred eighty-one".