42551129 has 4 divisors (see below), whose sum is σ = 42575076. Its totient is φ = 42527184.

The previous prime is 42551111. The next prime is 42551141. The reversal of 42551129 is 92115524.

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

It can be written as a sum of positive squares in 2 ways, for example, as 29214025 + 13337104 = 5405^2 + 3652^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42551129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42551429) 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, 9074 + ... + 12939.

It is an arithmetic number, because the mean of its divisors is an integer number (10643769).

Almost surely, 2^42551129 is an apocalyptic number.

It is an amenable number.

42551129 is a deficient number, since it is larger than the sum of its proper divisors (23947).

42551129 is a wasteful number, since it uses less digits than its factorization.

42551129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23946.

The product of its digits is 3600, while the sum is 29.

The square root of 42551129 is about 6523.1226418028. The cubic root of 42551129 is about 349.1164899870.

The spelling of 42551129 in words is "forty-two million, five hundred fifty-one thousand, one hundred twenty-nine".