1161265201 has 4 divisors (see below), whose sum is σ = 1175256432. Its totient is φ = 1147273972.

The previous prime is 1161265153. The next prime is 1161265211. The reversal of 1161265201 is 1025621611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1161265201 - 2²⁷ = 1027047473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161265211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6995491 + ... + 6995656.

It is an arithmetic number, because the mean of its divisors is an integer number (293814108).

Almost surely, 2^1161265201 is an apocalyptic number.

It is an amenable number.

1161265201 is a deficient number, since it is larger than the sum of its proper divisors (13991231).

1161265201 is an equidigital number, since it uses as much as digits as its factorization.

1161265201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13991230.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1161265201 is about 34077.3414602724. The cubic root of 1161265201 is about 1051.0994382654.

Adding to 1161265201 its reverse (1025621611), we get a palindrome (2186886812).

The spelling of 1161265201 in words is "one billion, one hundred sixty-one million, two hundred sixty-five thousand, two hundred one".