1543130891 has 2 divisors, whose sum is σ = 1543130892. Its totient is φ = 1543130890.

The previous prime is 1543130887. The next prime is 1543130909. The reversal of 1543130891 is 1980313451.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1543130891 - 2² = 1543130887 is a prime.

It is not a weakly prime, because it can be changed into another prime (1543130591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771565445 + 771565446.

It is an arithmetic number, because the mean of its divisors is an integer number (771565446).

Almost surely, 2^1543130891 is an apocalyptic number.

1543130891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1543130891 is an equidigital number, since it uses as much as digits as its factorization.

1543130891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 1543130891 is about 39282.7047312173. The cubic root of 1543130891 is about 1155.5824079953.

The spelling of 1543130891 in words is "one billion, five hundred forty-three million, one hundred thirty thousand, eight hundred ninety-one".