1165895621 has 12 divisors (see below), whose sum is σ = 1294223532. Its totient is φ = 1049400000.

The previous prime is 1165895617. The next prime is 1165895657. The reversal of 1165895621 is 1265985611.

It can be written as a sum of positive squares in 2 ways, for example, as 656896900 + 508998721 = 25630^2 + 22561^2 .

It is not a de Polignac number, because 1165895621 - 2² = 1165895617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165895021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35480 + ... + 59921.

It is an arithmetic number, because the mean of its divisors is an integer number (107851961).

Almost surely, 2^1165895621 is an apocalyptic number.

1165895621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1165895621 is a deficient number, since it is larger than the sum of its proper divisors (128327911).

1165895621 is a wasteful number, since it uses less digits than its factorization.

1165895621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95524 (or 95513 counting only the distinct ones).

The product of its digits is 129600, while the sum is 44.

The square root of 1165895621 is about 34145.2137348707. The cubic root of 1165895621 is about 1052.4946341337.

The spelling of 1165895621 in words is "one billion, one hundred sixty-five million, eight hundred ninety-five thousand, six hundred twenty-one".