42164891 has 2 divisors, whose sum is σ = 42164892. Its totient is φ = 42164890.

The previous prime is 42164849. The next prime is 42164917. The reversal of 42164891 is 19846124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42164891 - 2¹⁴ = 42148507 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42164821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21082445 + 21082446.

It is an arithmetic number, because the mean of its divisors is an integer number (21082446).

Almost surely, 2^42164891 is an apocalyptic number.

42164891 is a deficient number, since it is larger than the sum of its proper divisors (1).

42164891 is an equidigital number, since it uses as much as digits as its factorization.

42164891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 42164891 is about 6493.4498535062. The cubic root of 42164891 is about 348.0569637451.

The spelling of 42164891 in words is "forty-two million, one hundred sixty-four thousand, eight hundred ninety-one".