1091645617 has 2 divisors, whose sum is σ = 1091645618. Its totient is φ = 1091645616.

The previous prime is 1091645593. The next prime is 1091645647. The reversal of 1091645617 is 7165461901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1052094096 + 39551521 = 32436^2 + 6289^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091645617 - 2¹¹ = 1091643569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1091645617.

It is not a weakly prime, because it can be changed into another prime (1091645647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545822808 + 545822809.

It is an arithmetic number, because the mean of its divisors is an integer number (545822809).

Almost surely, 2^1091645617 is an apocalyptic number.

It is an amenable number.

1091645617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091645617 is an equidigital number, since it uses as much as digits as its factorization.

1091645617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 1091645617 is about 33040.0607898957. The cubic root of 1091645617 is about 1029.6601187937.

The spelling of 1091645617 in words is "one billion, ninety-one million, six hundred forty-five thousand, six hundred seventeen".