42887851 has 2 divisors, whose sum is σ = 42887852. Its totient is φ = 42887850.

The previous prime is 42887827. The next prime is 42887869. The reversal of 42887851 is 15878824.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42887851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42887798 and 42887807.

It is not a weakly prime, because it can be changed into another prime (42887891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21443925 + 21443926.

It is an arithmetic number, because the mean of its divisors is an integer number (21443926).

Almost surely, 2^42887851 is an apocalyptic number.

42887851 is a deficient number, since it is larger than the sum of its proper divisors (1).

42887851 is an equidigital number, since it uses as much as digits as its factorization.

42887851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 143360, while the sum is 43.

The square root of 42887851 is about 6548.8816602531. The cubic root of 42887851 is about 350.0349652143.

The spelling of 42887851 in words is "forty-two million, eight hundred eighty-seven thousand, eight hundred fifty-one".