42356891 has 2 divisors, whose sum is σ = 42356892. Its totient is φ = 42356890.

The previous prime is 42356887. The next prime is 42356921. The reversal of 42356891 is 19865324.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42356891 - 2² = 42356887 is a prime.

It is not a weakly prime, because it can be changed into another prime (42356851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21178445 + 21178446.

It is an arithmetic number, because the mean of its divisors is an integer number (21178446).

Almost surely, 2^42356891 is an apocalyptic number.

42356891 is a deficient number, since it is larger than the sum of its proper divisors (1).

42356891 is an equidigital number, since it uses as much as digits as its factorization.

42356891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 42356891 is about 6508.2171905984. The cubic root of 42356891 is about 348.5844623187.

The spelling of 42356891 in words is "forty-two million, three hundred fifty-six thousand, eight hundred ninety-one".