1165632201 has 20 divisors (see below), whose sum is σ = 1788318532. Its totient is φ = 756083808.

The previous prime is 1165632191. The next prime is 1165632253. The reversal of 1165632201 is 1022365611.

1165632201 is a `hidden beast` number, since 1 + 1 + 6 + 5 + 632 + 20 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 942428601 + 223203600 = 30699^2 + 14940^2 .

It is not a de Polignac number, because 1165632201 - 2⁷ = 1165632073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1165632001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 191470 + ... + 197463.

Almost surely, 2^1165632201 is an apocalyptic number.

It is an amenable number.

1165632201 is a deficient number, since it is larger than the sum of its proper divisors (622686331).

1165632201 is an equidigital number, since it uses as much as digits as its factorization.

1165632201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388982 (or 388973 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1165632201 is about 34141.3561681431. The cubic root of 1165632201 is about 1052.4153620232.

Adding to 1165632201 its reverse (1022365611), we get a palindrome (2187997812).

The spelling of 1165632201 in words is "one billion, one hundred sixty-five million, six hundred thirty-two thousand, two hundred one".