1091851543 has 2 divisors, whose sum is σ = 1091851544. Its totient is φ = 1091851542.

The previous prime is 1091851531. The next prime is 1091851559. The reversal of 1091851543 is 3451581901.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1091851543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091851573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545925771 + 545925772.

It is an arithmetic number, because the mean of its divisors is an integer number (545925772).

Almost surely, 2^1091851543 is an apocalyptic number.

1091851543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091851543 is an equidigital number, since it uses as much as digits as its factorization.

1091851543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 1091851543 is about 33043.1769507715. The cubic root of 1091851543 is about 1029.7248591134.

The spelling of 1091851543 in words is "one billion, ninety-one million, eight hundred fifty-one thousand, five hundred forty-three".