1091123017 has 2 divisors, whose sum is σ = 1091123018. Its totient is φ = 1091123016.

The previous prime is 1091123009. The next prime is 1091123029. The reversal of 1091123017 is 7103211901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 920454921 + 170668096 = 30339^2 + 13064^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091123017 - 2³ = 1091123009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1091122982 and 1091123000.

It is not a weakly prime, because it can be changed into another prime (1091123717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545561508 + 545561509.

It is an arithmetic number, because the mean of its divisors is an integer number (545561509).

Almost surely, 2^1091123017 is an apocalyptic number.

It is an amenable number.

1091123017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091123017 is an equidigital number, since it uses as much as digits as its factorization.

1091123017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 378, while the sum is 25.

The square root of 1091123017 is about 33032.1512620659. The cubic root of 1091123017 is about 1029.4957839399.

Adding to 1091123017 its reverse (7103211901), we get a palindrome (8194334918).

The spelling of 1091123017 in words is "one billion, ninety-one million, one hundred twenty-three thousand, seventeen".