43409131 has 2 divisors, whose sum is σ = 43409132. Its totient is φ = 43409130.

The previous prime is 43409117. The next prime is 43409137. The reversal of 43409131 is 13190434.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43409131 - 2²⁵ = 9854699 is a prime.

It is a super-3 number, since 3×43409131³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 43409096 and 43409105.

It is not a weakly prime, because it can be changed into another prime (43409137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21704565 + 21704566.

It is an arithmetic number, because the mean of its divisors is an integer number (21704566).

Almost surely, 2^43409131 is an apocalyptic number.

43409131 is a deficient number, since it is larger than the sum of its proper divisors (1).

43409131 is an equidigital number, since it uses as much as digits as its factorization.

43409131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 43409131 is about 6588.5606167053. The cubic root of 43409131 is about 351.4474236210.

Adding to 43409131 its reverse (13190434), we get a palindrome (56599565).

The spelling of 43409131 in words is "forty-three million, four hundred nine thousand, one hundred thirty-one".