1161203265 has 24 divisors (see below), whose sum is σ = 2021409000. Its totient is φ = 616644864.

The previous prime is 1161203233. The next prime is 1161203273. The reversal of 1161203265 is 5623021611.

1161203265 is a `hidden beast` number, since 11 + 612 + 0 + 32 + 6 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 198218241 + 962985024 = 14079^2 + 31032^2 .

It is not a de Polignac number, because 1161203265 - 2⁵ = 1161203233 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44890 + ... + 65859.

It is an arithmetic number, because the mean of its divisors is an integer number (84225375).

Almost surely, 2^1161203265 is an apocalyptic number.

1161203265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1161203265 is a deficient number, since it is larger than the sum of its proper divisors (860205735).

1161203265 is a wasteful number, since it uses less digits than its factorization.

1161203265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110993 (or 110990 counting only the distinct ones).

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

The square root of 1161203265 is about 34076.4326918180. The cubic root of 1161203265 is about 1051.0807511610.

Adding to 1161203265 its reverse (5623021611), we get a palindrome (6784224876).

The spelling of 1161203265 in words is "one billion, one hundred sixty-one million, two hundred three thousand, two hundred sixty-five".