43012631 has 2 divisors, whose sum is σ = 43012632. Its totient is φ = 43012630.

The previous prime is 43012579. The next prime is 43012639. The reversal of 43012631 is 13621034.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43012631 is a prime.

It is a super-2 number, since 2×43012631² = 3700172851084322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43012639) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21506315 + 21506316.

It is an arithmetic number, because the mean of its divisors is an integer number (21506316).

Almost surely, 2^43012631 is an apocalyptic number.

43012631 is a deficient number, since it is larger than the sum of its proper divisors (1).

43012631 is an equidigital number, since it uses as much as digits as its factorization.

43012631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 43012631 is about 6558.4015583067. The cubic root of 43012631 is about 350.3741061075.

Adding to 43012631 its reverse (13621034), we get a palindrome (56633665).

The spelling of 43012631 in words is "forty-three million, twelve thousand, six hundred thirty-one".