1491059543 has 2 divisors, whose sum is σ = 1491059544. Its totient is φ = 1491059542.

The previous prime is 1491059527. The next prime is 1491059611. The reversal of 1491059543 is 3459501941.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1491059543 - 2⁴ = 1491059527 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1491059543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1491059243) 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, 745529771 + 745529772.

It is an arithmetic number, because the mean of its divisors is an integer number (745529772).

Almost surely, 2^1491059543 is an apocalyptic number.

1491059543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491059543 is an equidigital number, since it uses as much as digits as its factorization.

1491059543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 1491059543 is about 38614.2401582629. The cubic root of 1491059543 is about 1142.4354271801.

The spelling of 1491059543 in words is "one billion, four hundred ninety-one million, fifty-nine thousand, five hundred forty-three".