1816056181 has 2 divisors, whose sum is σ = 1816056182. Its totient is φ = 1816056180.

The previous prime is 1816056107. The next prime is 1816056211. The reversal of 1816056181 is 1816506181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1816038225 + 17956 = 42615^2 + 134^2 .

It is a cyclic number.

It is not a de Polignac number, because 1816056181 - 2⁹ = 1816055669 is a prime.

It is a super-3 number, since 3×1816056181³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1816056181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1816056881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 908028090 + 908028091.

It is an arithmetic number, because the mean of its divisors is an integer number (908028091).

Almost surely, 2^1816056181 is an apocalyptic number.

It is an amenable number.

1816056181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1816056181 is an equidigital number, since it uses as much as digits as its factorization.

1816056181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 37.

The square root of 1816056181 is about 42615.2106764709. The cubic root of 1816056181 is about 1220.0466212140.

The spelling of 1816056181 in words is "one billion, eight hundred sixteen million, fifty-six thousand, one hundred eighty-one".