1840732181 has 2 divisors, whose sum is σ = 1840732182. Its totient is φ = 1840732180.

The previous prime is 1840732177. The next prime is 1840732189. The reversal of 1840732181 is 1812370481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 997991281 + 842740900 = 31591^2 + 29030^2 .

It is an emirp because it is prime and its reverse (1812370481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1840732181 - 2² = 1840732177 is a prime.

It is a super-2 number, since 2×1840732181² = 6776589924338033522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1840732189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 920366090 + 920366091.

It is an arithmetic number, because the mean of its divisors is an integer number (920366091).

Almost surely, 2^1840732181 is an apocalyptic number.

It is an amenable number.

1840732181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1840732181 is an equidigital number, since it uses as much as digits as its factorization.

1840732181 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 square root of 1840732181 is about 42903.7548589864. The cubic root of 1840732181 is about 1225.5476503959.

The spelling of 1840732181 in words is "one billion, eight hundred forty million, seven hundred thirty-two thousand, one hundred eighty-one".