1091851559 has 2 divisors, whose sum is σ = 1091851560. Its totient is φ = 1091851558.

The previous prime is 1091851543. The next prime is 1091851573. The reversal of 1091851559 is 9551581901.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1091851559 - 2⁴ = 1091851543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091851529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545925779 + 545925780.

It is an arithmetic number, because the mean of its divisors is an integer number (545925780).

Almost surely, 2^1091851559 is an apocalyptic number.

1091851559 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091851559 is an equidigital number, since it uses as much as digits as its factorization.

1091851559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81000, while the sum is 44.

The square root of 1091851559 is about 33043.1771928790. The cubic root of 1091851559 is about 1029.7248641432.

The spelling of 1091851559 in words is "one billion, ninety-one million, eight hundred fifty-one thousand, five hundred fifty-nine".