43636121 has 2 divisors, whose sum is σ = 43636122. Its totient is φ = 43636120.

The previous prime is 43636081. The next prime is 43636133. The reversal of 43636121 is 12163634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42510400 + 1125721 = 6520^2 + 1061^2 .

It is a cyclic number.

It is not a de Polignac number, because 43636121 - 2²² = 39441817 is a prime.

It is a super-2 number, since 2×43636121² = 3808222111853282, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (43636181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21818060 + 21818061.

It is an arithmetic number, because the mean of its divisors is an integer number (21818061).

Almost surely, 2^43636121 is an apocalyptic number.

It is an amenable number.

43636121 is a deficient number, since it is larger than the sum of its proper divisors (1).

43636121 is an equidigital number, since it uses as much as digits as its factorization.

43636121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

The square root of 43636121 is about 6605.7642252808. The cubic root of 43636121 is about 352.0589416837.

Adding to 43636121 its reverse (12163634), we get a palindrome (55799755).

The spelling of 43636121 in words is "forty-three million, six hundred thirty-six thousand, one hundred twenty-one".