1131220201 has 4 divisors (see below), whose sum is σ = 1180403712. Its totient is φ = 1082036692.

The previous prime is 1131220199. The next prime is 1131220241. The reversal of 1131220201 is 1020221311.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1020221311 = 43 ⋅23726077.

It is a cyclic number.

It is not a de Polignac number, because 1131220201 - 2¹ = 1131220199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131220241) 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, 24591721 + ... + 24591766.

It is an arithmetic number, because the mean of its divisors is an integer number (295100928).

Almost surely, 2^1131220201 is an apocalyptic number.

It is an amenable number.

1131220201 is a deficient number, since it is larger than the sum of its proper divisors (49183511).

1131220201 is an equidigital number, since it uses as much as digits as its factorization.

1131220201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49183510.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1131220201 is about 33633.6171263217. The cubic root of 1131220201 is about 1041.9552102572.

Adding to 1131220201 its reverse (1020221311), we get a palindrome (2151441512).

It can be divided in two parts, 11312 and 20201, that added together give a palindrome (31513).

The spelling of 1131220201 in words is "one billion, one hundred thirty-one million, two hundred twenty thousand, two hundred one".