43113131 has 2 divisors, whose sum is σ = 43113132. Its totient is φ = 43113130.

The previous prime is 43113121. The next prime is 43113137. The reversal of 43113131 is 13131134.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43113131 is a prime.

It is a super-2 number, since 2×43113131² = 3717484129246322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43113137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21556565 + 21556566.

It is an arithmetic number, because the mean of its divisors is an integer number (21556566).

Almost surely, 2^43113131 is an apocalyptic number.

43113131 is a deficient number, since it is larger than the sum of its proper divisors (1).

43113131 is an equidigital number, since it uses as much as digits as its factorization.

43113131 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 43113131 is about 6566.0590158786. The cubic root of 43113131 is about 350.6467795631.

Adding to 43113131 its reverse (13131134), we get a palindrome (56244265).

The spelling of 43113131 in words is "forty-three million, one hundred thirteen thousand, one hundred thirty-one".