43542551 has 4 divisors (see below), whose sum is σ = 46891992. Its totient is φ = 40193112.

The previous prime is 43542523. The next prime is 43542581. The reversal of 43542551 is 15524534.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 43542551 - 2¹⁸ = 43280407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43542581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1674701 + ... + 1674726.

It is an arithmetic number, because the mean of its divisors is an integer number (11722998).

Almost surely, 2^43542551 is an apocalyptic number.

43542551 is a deficient number, since it is larger than the sum of its proper divisors (3349441).

43542551 is a wasteful number, since it uses less digits than its factorization.

43542551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3349440.

The product of its digits is 12000, while the sum is 29.

The square root of 43542551 is about 6598.6779736550. The cubic root of 43542551 is about 351.8071187387.

The spelling of 43542551 in words is "forty-three million, five hundred forty-two thousand, five hundred fifty-one".