1091889593 has 2 divisors, whose sum is σ = 1091889594. Its totient is φ = 1091889592.

The previous prime is 1091889581. The next prime is 1091889613. The reversal of 1091889593 is 3959881901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1091443369 + 446224 = 33037^2 + 668^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091889593 - 2¹² = 1091885497 is a prime.

It is not a weakly prime, because it can be changed into another prime (1091889563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545944796 + 545944797.

It is an arithmetic number, because the mean of its divisors is an integer number (545944797).

Almost surely, 2^1091889593 is an apocalyptic number.

It is an amenable number.

1091889593 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091889593 is an equidigital number, since it uses as much as digits as its factorization.

1091889593 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 53.

The square root of 1091889593 is about 33043.7527075845. The cubic root of 1091889593 is about 1029.7368206222.

The spelling of 1091889593 in words is "one billion, ninety-one million, eight hundred eighty-nine thousand, five hundred ninety-three".