36663181 has 2 divisors, whose sum is σ = 36663182. Its totient is φ = 36663180.

The previous prime is 36663161. The next prime is 36663191. The reversal of 36663181 is 18136663.

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., 29877156 + 6786025 = 5466^2 + 2605^2 .

It is a cyclic number.

It is not a de Polignac number, because 36663181 - 2⁹ = 36662669 is a prime.

It is a super-2 number, since 2×36663181² = 2688377682077522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36663161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18331590 + 18331591.

It is an arithmetic number, because the mean of its divisors is an integer number (18331591).

Almost surely, 2^36663181 is an apocalyptic number.

It is an amenable number.

36663181 is a deficient number, since it is larger than the sum of its proper divisors (1).

36663181 is an equidigital number, since it uses as much as digits as its factorization.

36663181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The square root of 36663181 is about 6055.0128819021. The cubic root of 36663181 is about 332.2079701711.

The spelling of 36663181 in words is "thirty-six million, six hundred sixty-three thousand, one hundred eighty-one".