1083768561 has 6 divisors (see below), whose sum is σ = 1565443490. Its totient is φ = 722512368.

The previous prime is 1083768557. The next prime is 1083768601. The reversal of 1083768561 is 1658673801.

1083768561 is a `hidden beast` number, since 1 + 0 + 83 + 7 + 6 + 8 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 978500961 + 105267600 = 31281^2 + 10260^2 .

It is not a de Polignac number, because 1083768561 - 2² = 1083768557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1083768551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 60209356 + ... + 60209373.

Almost surely, 2^1083768561 is an apocalyptic number.

It is an amenable number.

1083768561 is a deficient number, since it is larger than the sum of its proper divisors (481674929).

1083768561 is a wasteful number, since it uses less digits than its factorization.

1083768561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120418735 (or 120418732 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 1083768561 is about 32920.6403491791. The cubic root of 1083768561 is about 1027.1775435131.

The spelling of 1083768561 in words is "one billion, eighty-three million, seven hundred sixty-eight thousand, five hundred sixty-one".