1918181911 has 2 divisors, whose sum is σ = 1918181912. Its totient is φ = 1918181910.

The previous prime is 1918181897. The next prime is 1918181921. The reversal of 1918181911 is 1191818191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1918181911 - 2⁹ = 1918181399 is a prime.

It is a super-2 number, since 2×1918181911² = 7358843687375223842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1918181921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 959090955 + 959090956.

It is an arithmetic number, because the mean of its divisors is an integer number (959090956).

Almost surely, 2^1918181911 is an apocalyptic number.

1918181911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1918181911 is an equidigital number, since it uses as much as digits as its factorization.

1918181911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 40.

The square root of 1918181911 is about 43797.0536794429. The cubic root of 1918181911 is about 1242.5005711800.

The spelling of 1918181911 in words is "one billion, nine hundred eighteen million, one hundred eighty-one thousand, nine hundred eleven".