42173851 has 4 divisors (see below), whose sum is σ = 42477400. Its totient is φ = 41870304.

The previous prime is 42173843. The next prime is 42173861. The reversal of 42173851 is 15837124.

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 42173851 - 2³ = 42173843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42173861) 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, 151566 + ... + 151843.

It is an arithmetic number, because the mean of its divisors is an integer number (10619350).

Almost surely, 2^42173851 is an apocalyptic number.

42173851 is a deficient number, since it is larger than the sum of its proper divisors (303549).

42173851 is a wasteful number, since it uses less digits than its factorization.

42173851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303548.

The product of its digits is 6720, while the sum is 31.

The square root of 42173851 is about 6494.1397428759. The cubic root of 42173851 is about 348.0816159257.

The spelling of 42173851 in words is "forty-two million, one hundred seventy-three thousand, eight hundred fifty-one".