1165006521 has 24 divisors (see below), whose sum is σ = 1924575744. Its totient is φ = 665236800.

The previous prime is 1165006499. The next prime is 1165006523. The reversal of 1165006521 is 1256005611.

It is a happy number.

1165006521 is a `hidden beast` number, since 1 + 1 + 6 + 5 + 0 + 0 + 652 + 1 = 666.

It is not a de Polignac number, because 1165006521 - 2²² = 1160812217 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1165006523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92821 + ... + 104621.

It is an arithmetic number, because the mean of its divisors is an integer number (80190656).

Almost surely, 2^1165006521 is an apocalyptic number.

It is an amenable number.

1165006521 is a deficient number, since it is larger than the sum of its proper divisors (759569223).

1165006521 is a wasteful number, since it uses less digits than its factorization.

1165006521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13381 (or 13378 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 1165006521 is about 34132.1918575412. The cubic root of 1165006521 is about 1052.2270255721.

The spelling of 1165006521 in words is "one billion, one hundred sixty-five million, six thousand, five hundred twenty-one".