1161272201 has 4 divisors (see below), whose sum is σ = 1201316100. Its totient is φ = 1121228304.

The previous prime is 1161272179. The next prime is 1161272221. The reversal of 1161272201 is 1022721611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 371718400 + 789553801 = 19280^2 + 28099^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161272201 - 2¹⁴ = 1161255817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161272221) 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, 20021906 + ... + 20021963.

It is an arithmetic number, because the mean of its divisors is an integer number (300329025).

Almost surely, 2^1161272201 is an apocalyptic number.

It is an amenable number.

1161272201 is a deficient number, since it is larger than the sum of its proper divisors (40043899).

1161272201 is an equidigital number, since it uses as much as digits as its factorization.

1161272201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40043898.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 1161272201 is about 34077.4441676602. Note that the first 3 decimals coincide. The cubic root of 1161272201 is about 1051.1015502381.

Adding to 1161272201 its reverse (1022721611), we get a palindrome (2183993812).

The spelling of 1161272201 in words is "one billion, one hundred sixty-one million, two hundred seventy-two thousand, two hundred one".