8181774037 has 2 divisors, whose sum is σ = 8181774038. Its totient is φ = 8181774036.

The previous prime is 8181774017. The next prime is 8181774043. The reversal of 8181774037 is 7304771818.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7959137796 + 222636241 = 89214^2 + 14921^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8181774037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8181774017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4090887018 + 4090887019.

It is an arithmetic number, because the mean of its divisors is an integer number (4090887019).

Almost surely, 2^8181774037 is an apocalyptic number.

It is an amenable number.

8181774037 is a deficient number, since it is larger than the sum of its proper divisors (1).

8181774037 is an equidigital number, since it uses as much as digits as its factorization.

8181774037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 263424, while the sum is 46.

The square root of 8181774037 is about 90453.1593533360. The cubic root of 8181774037 is about 2015.0345346042.

The spelling of 8181774037 in words is "eight billion, one hundred eighty-one million, seven hundred seventy-four thousand, thirty-seven".