1071918181 has 2 divisors, whose sum is σ = 1071918182. Its totient is φ = 1071918180.

The previous prime is 1071918179. The next prime is 1071918241. The reversal of 1071918181 is 1818191701.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 771450625 + 300467556 = 27775^2 + 17334^2 .

It is a cyclic number.

It is not a de Polignac number, because 1071918181 - 2¹ = 1071918179 is a prime.

It is a super-2 number, since 2×1071918181² = 2298017173516697522, which contains 22 as substring.

Together with 1071918179, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1071918181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1071918101) 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, 535959090 + 535959091.

It is an arithmetic number, because the mean of its divisors is an integer number (535959091).

Almost surely, 2^1071918181 is an apocalyptic number.

It is an amenable number.

1071918181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1071918181 is an equidigital number, since it uses as much as digits as its factorization.

1071918181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 37.

The square root of 1071918181 is about 32740.1615909268. The cubic root of 1071918181 is about 1023.4199509938.

It can be divided in two parts, 10719 and 18181, that added together give a square (28900 = 170²).

The spelling of 1071918181 in words is "one billion, seventy-one million, nine hundred eighteen thousand, one hundred eighty-one".