542456891 has 2 divisors, whose sum is σ = 542456892. Its totient is φ = 542456890.

The previous prime is 542456881. The next prime is 542456899. The reversal of 542456891 is 198654245.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-542456891 is a prime.

It is not a weakly prime, because it can be changed into another prime (542456899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271228445 + 271228446.

It is an arithmetic number, because the mean of its divisors is an integer number (271228446).

Almost surely, 2^542456891 is an apocalyptic number.

542456891 is a deficient number, since it is larger than the sum of its proper divisors (1).

542456891 is an equidigital number, since it uses as much as digits as its factorization.

542456891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345600, while the sum is 44.

The square root of 542456891 is about 23290.7039610227. The cubic root of 542456891 is about 815.5584219149.

The spelling of 542456891 in words is "five hundred forty-two million, four hundred fifty-six thousand, eight hundred ninety-one".