1165564901 has 16 divisors (see below), whose sum is σ = 1196603520. Its totient is φ = 1135088640.

The previous prime is 1165564889. The next prime is 1165564909. The reversal of 1165564901 is 1094655611.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1165564901 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 (1165564909) 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 15 ways as a sum of consecutive naturals, for example, 1846856 + ... + 1847486.

It is an arithmetic number, because the mean of its divisors is an integer number (74787720).

Almost surely, 2^1165564901 is an apocalyptic number.

It is an amenable number.

1165564901 is a deficient number, since it is larger than the sum of its proper divisors (31038619).

1165564901 is a wasteful number, since it uses less digits than its factorization.

1165564901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 1165564901 is about 34140.3705457337. The cubic root of 1165564901 is about 1052.3951072301.

The spelling of 1165564901 in words is "one billion, one hundred sixty-five million, five hundred sixty-four thousand, nine hundred one".