42056851 has 4 divisors (see below), whose sum is σ = 42194152. Its totient is φ = 41919552.

The previous prime is 42056849. The next prime is 42056867. The reversal of 42056851 is 15865024.

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 42056851 - 2¹ = 42056849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42056831) 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, 68190 + ... + 68803.

It is an arithmetic number, because the mean of its divisors is an integer number (10548538).

Almost surely, 2^42056851 is an apocalyptic number.

42056851 is a deficient number, since it is larger than the sum of its proper divisors (137301).

42056851 is a wasteful number, since it uses less digits than its factorization.

42056851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137300.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 42056851 is about 6485.1253650180. The cubic root of 42056851 is about 347.7594315473.

The spelling of 42056851 in words is "forty-two million, fifty-six thousand, eight hundred fifty-one".