212080181 has 4 divisors (see below), whose sum is σ = 213306252. Its totient is φ = 210854112.

The previous prime is 212080163. The next prime is 212080199. The reversal of 212080181 is 181080212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (212080163) and next prime (212080199).

It can be written as a sum of positive squares in 2 ways, for example, as 181333156 + 30747025 = 13466^2 + 5545^2 .

It is a cyclic number.

It is not a de Polignac number, because 212080181 - 2¹⁸ = 211818037 is a prime.

It is a super-2 number, since 2×212080181² = 89956006345985522, which 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 (212080081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 612776 + ... + 613121.

It is an arithmetic number, because the mean of its divisors is an integer number (53326563).

Almost surely, 2^212080181 is an apocalyptic number.

It is an amenable number.

212080181 is a deficient number, since it is larger than the sum of its proper divisors (1226071).

212080181 is a wasteful number, since it uses less digits than its factorization.

212080181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1226070.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 212080181 is about 14562.9729451098. The cubic root of 212080181 is about 596.3483589111.

The spelling of 212080181 in words is "two hundred twelve million, eighty thousand, one hundred eighty-one".