43506401 has 2 divisors, whose sum is σ = 43506402. Its totient is φ = 43506400.

The previous prime is 43506373. The next prime is 43506403. The reversal of 43506401 is 10460534.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33362176 + 10144225 = 5776^2 + 3185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43506401 is a prime.

Together with 43506403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43506403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21753200 + 21753201.

It is an arithmetic number, because the mean of its divisors is an integer number (21753201).

Almost surely, 2^43506401 is an apocalyptic number.

It is an amenable number.

43506401 is a deficient number, since it is larger than the sum of its proper divisors (1).

43506401 is an equidigital number, since it uses as much as digits as its factorization.

43506401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 43506401 is about 6595.9382198441. The cubic root of 43506401 is about 351.7097324027.

Adding to 43506401 its reverse (10460534), we get a palindrome (53966935).

The spelling of 43506401 in words is "forty-three million, five hundred six thousand, four hundred one".