7918212181 has 16 divisors (see below), whose sum is σ = 8736569280. Its totient is φ = 7116551680.

The previous prime is 7918212151. The next prime is 7918212191. The reversal of 7918212181 is 1812128197.

It is a cyclic number.

It is not a de Polignac number, because 7918212181 - 2⁵ = 7918212149 is a prime.

It is a super-2 number, since 2×7918212181² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7918212101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 592485 + ... + 605701.

It is an arithmetic number, because the mean of its divisors is an integer number (546035580).

Almost surely, 2^7918212181 is an apocalyptic number.

It is an amenable number.

7918212181 is a deficient number, since it is larger than the sum of its proper divisors (818357099).

7918212181 is a wasteful number, since it uses less digits than its factorization.

7918212181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13844.

The product of its digits is 16128, while the sum is 40.

The square root of 7918212181 is about 88984.3367171998. The cubic root of 7918212181 is about 1993.1609890374.

The spelling of 7918212181 in words is "seven billion, nine hundred eighteen million, two hundred twelve thousand, one hundred eighty-one".