1165331601 has 24 divisors (see below), whose sum is σ = 1928209920. Its totient is φ = 664350336.

The previous prime is 1165331551. The next prime is 1165331611. The reversal of 1165331601 is 1061335611.

1165331601 is a `hidden beast` number, since 1 + 1 + 6 + 53 + 3 + 1 + 601 = 666.

It is not a de Polignac number, because 1165331601 - 2¹⁸ = 1165069457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1165331611) 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, 5920 + ... + 48638.

It is an arithmetic number, because the mean of its divisors is an integer number (80342080).

Almost surely, 2^1165331601 is an apocalyptic number.

It is an amenable number.

1165331601 is a deficient number, since it is larger than the sum of its proper divisors (762878319).

1165331601 is a wasteful number, since it uses less digits than its factorization.

1165331601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43165 (or 43162 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 1165331601 is about 34136.9535987030. The cubic root of 1165331601 is about 1052.3248865839.

The spelling of 1165331601 in words is "one billion, one hundred sixty-five million, three hundred thirty-one thousand, six hundred one".