320542891 has 2 divisors, whose sum is σ = 320542892. Its totient is φ = 320542890.

The previous prime is 320542847. The next prime is 320542903. The reversal of 320542891 is 198245023.

It is a strong prime.

It is an emirp because it is prime and its reverse (198245023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320542891 - 2⁹ = 320542379 is a prime.

It is equal to p_17302894 and since 320542891 and 17302894 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (320542091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160271445 + 160271446.

It is an arithmetic number, because the mean of its divisors is an integer number (160271446).

Almost surely, 2^320542891 is an apocalyptic number.

320542891 is a deficient number, since it is larger than the sum of its proper divisors (1).

320542891 is an equidigital number, since it uses as much as digits as its factorization.

320542891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 320542891 is about 17903.7116542911. The cubic root of 320542891 is about 684.3769645308.

The spelling of 320542891 in words is "three hundred twenty million, five hundred forty-two thousand, eight hundred ninety-one".