36808181 has 4 divisors (see below), whose sum is σ = 36835200. Its totient is φ = 36781164.

The previous prime is 36808169. The next prime is 36808199. The reversal of 36808181 is 18180863.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 36808181 - 2⁶ = 36808117 is a prime.

It is a super-2 number, since 2×36808181² = 2709684377057522, 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 (36808141) 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, 11351 + ... + 14228.

It is an arithmetic number, because the mean of its divisors is an integer number (9208800).

Almost surely, 2^36808181 is an apocalyptic number.

It is an amenable number.

36808181 is a deficient number, since it is larger than the sum of its proper divisors (27019).

36808181 is a wasteful number, since it uses less digits than its factorization.

36808181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27018.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 36808181 is about 6066.9746167262. The cubic root of 36808181 is about 332.6453462203.

The spelling of 36808181 in words is "thirty-six million, eight hundred eight thousand, one hundred eighty-one".