40236181 has 2 divisors, whose sum is σ = 40236182. Its totient is φ = 40236180.

The previous prime is 40236179. The next prime is 40236187. The reversal of 40236181 is 18163204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40068900 + 167281 = 6330^2 + 409^2 .

It is a cyclic number.

It is not a de Polignac number, because 40236181 - 2¹ = 40236179 is a prime.

It is a super-2 number, since 2×40236181² = 3237900522929522, which contains 22 as substring.

Together with 40236179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40236187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20118090 + 20118091.

It is an arithmetic number, because the mean of its divisors is an integer number (20118091).

Almost surely, 2^40236181 is an apocalyptic number.

It is an amenable number.

40236181 is a deficient number, since it is larger than the sum of its proper divisors (1).

40236181 is an equidigital number, since it uses as much as digits as its factorization.

40236181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 40236181 is about 6343.1995869593. The cubic root of 40236181 is about 342.6669752546. Note that the first 3 decimals are identical.

Adding to 40236181 its reverse (18163204), we get a palindrome (58399385).

The spelling of 40236181 in words is "forty million, two hundred thirty-six thousand, one hundred eighty-one".