12015181 has 2 divisors, whose sum is σ = 12015182. Its totient is φ = 12015180.

The previous prime is 12015169. The next prime is 12015187. The reversal of 12015181 is 18151021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12013156 + 2025 = 3466^2 + 45^2 .

It is a cyclic number.

It is not a de Polignac number, because 12015181 - 2¹⁷ = 11884109 is a prime.

It is a super-2 number, since 2×12015181² = 288729148925522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12015187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6007590 + 6007591.

It is an arithmetic number, because the mean of its divisors is an integer number (6007591).

Almost surely, 2^12015181 is an apocalyptic number.

It is an amenable number.

12015181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12015181 is an equidigital number, since it uses as much as digits as its factorization.

12015181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 19.

The square root of 12015181 is about 3466.2921111759. The cubic root of 12015181 is about 229.0393517545.

The spelling of 12015181 in words is "twelve million, fifteen thousand, one hundred eighty-one".