1080665591 has 2 divisors, whose sum is σ = 1080665592. Its totient is φ = 1080665590.

The previous prime is 1080665581. The next prime is 1080665633. The reversal of 1080665591 is 1955660801.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1080665591 - 2³⁰ = 6923767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1080665581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540332795 + 540332796.

It is an arithmetic number, because the mean of its divisors is an integer number (540332796).

Almost surely, 2^1080665591 is an apocalyptic number.

1080665591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1080665591 is an equidigital number, since it uses as much as digits as its factorization.

1080665591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 1080665591 is about 32873.4785351353. The cubic root of 1080665591 is about 1026.1962922416.

The spelling of 1080665591 in words is "one billion, eighty million, six hundred sixty-five thousand, five hundred ninety-one".