1165930821 has 16 divisors (see below), whose sum is σ = 1884333120. Its totient is φ = 706624560.

The previous prime is 1165930783. The next prime is 1165930861. The reversal of 1165930821 is 1280395611.

It is not a de Polignac number, because 1165930821 - 2⁹ = 1165930309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165930861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1962550 + ... + 1963143.

It is an arithmetic number, because the mean of its divisors is an integer number (117770820).

Almost surely, 2^1165930821 is an apocalyptic number.

1165930821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1165930821 is a deficient number, since it is larger than the sum of its proper divisors (718402299).

1165930821 is a wasteful number, since it uses less digits than its factorization.

1165930821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3925713 (or 3925707 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1165930821 is about 34145.7291765749. The cubic root of 1165930821 is about 1052.5052261162.

The spelling of 1165930821 in words is "one billion, one hundred sixty-five million, nine hundred thirty thousand, eight hundred twenty-one".