43131131 has 2 divisors, whose sum is σ = 43131132. Its totient is φ = 43131130.

The previous prime is 43131119. The next prime is 43131161. The reversal of 43131131 is 13113134.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43131131 - 2¹⁰ = 43130107 is a prime.

It is a super-2 number, since 2×43131131² = 3720588922678322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43131161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21565565 + 21565566.

It is an arithmetic number, because the mean of its divisors is an integer number (21565566).

Almost surely, 2^43131131 is an apocalyptic number.

43131131 is a deficient number, since it is larger than the sum of its proper divisors (1).

43131131 is an equidigital number, since it uses as much as digits as its factorization.

43131131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 17.

The square root of 43131131 is about 6567.4295580539. The cubic root of 43131131 is about 350.6955718429.

Adding to 43131131 its reverse (13113134), we get a palindrome (56244265).

The spelling of 43131131 in words is "forty-three million, one hundred thirty-one thousand, one hundred thirty-one".