42551807 has 4 divisors (see below), whose sum is σ = 42585816. Its totient is φ = 42517800.

The previous prime is 42551801. The next prime is 42551819. The reversal of 42551807 is 70815524.

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 42551807 - 2¹⁶ = 42486271 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 (42551801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15053 + ... + 17654.

It is an arithmetic number, because the mean of its divisors is an integer number (10646454).

Almost surely, 2^42551807 is an apocalyptic number.

42551807 is a deficient number, since it is larger than the sum of its proper divisors (34009).

42551807 is a wasteful number, since it uses less digits than its factorization.

42551807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34008.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 42551807 is about 6523.1746105711. The cubic root of 42551807 is about 349.1183442247.

The spelling of 42551807 in words is "forty-two million, five hundred fifty-one thousand, eight hundred seven".