43520551 has 2 divisors, whose sum is σ = 43520552. Its totient is φ = 43520550.

The previous prime is 43520549. The next prime is 43520563. The reversal of 43520551 is 15502534.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43520551 - 2¹ = 43520549 is a prime.

Together with 43520549, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43520501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21760275 + 21760276.

It is an arithmetic number, because the mean of its divisors is an integer number (21760276).

Almost surely, 2^43520551 is an apocalyptic number.

43520551 is a deficient number, since it is larger than the sum of its proper divisors (1).

43520551 is an equidigital number, since it uses as much as digits as its factorization.

43520551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 43520551 is about 6597.0107624590. The cubic root of 43520551 is about 351.7478582352.

The spelling of 43520551 in words is "forty-three million, five hundred twenty thousand, five hundred fifty-one".