1091371693 has 2 divisors, whose sum is σ = 1091371694. Its totient is φ = 1091371692.

The previous prime is 1091371669. The next prime is 1091371727. The reversal of 1091371693 is 3961731901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 958707369 + 132664324 = 30963^2 + 11518^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091371693 - 2¹⁷ = 1091240621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091371663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545685846 + 545685847.

It is an arithmetic number, because the mean of its divisors is an integer number (545685847).

Almost surely, 2^1091371693 is an apocalyptic number.

It is an amenable number.

1091371693 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091371693 is an equidigital number, since it uses as much as digits as its factorization.

1091371693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 1091371693 is about 33035.9151984624. The cubic root of 1091371693 is about 1029.5739882130.

The spelling of 1091371693 in words is "one billion, ninety-one million, three hundred seventy-one thousand, six hundred ninety-three".