1321181201 has 2 divisors, whose sum is σ = 1321181202. Its totient is φ = 1321181200.

The previous prime is 1321181179. The next prime is 1321181209. The reversal of 1321181201 is 1021811231.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1280208400 + 40972801 = 35780^2 + 6401^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321181201 - 2⁶ = 1321181137 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321181209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660590600 + 660590601.

It is an arithmetic number, because the mean of its divisors is an integer number (660590601).

Almost surely, 2^1321181201 is an apocalyptic number.

It is an amenable number.

1321181201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321181201 is an equidigital number, since it uses as much as digits as its factorization.

1321181201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 1321181201 is about 36348.0563579402. The cubic root of 1321181201 is about 1097.2884179345.

Adding to 1321181201 its reverse (1021811231), we get a palindrome (2342992432).

The spelling of 1321181201 in words is "one billion, three hundred twenty-one million, one hundred eighty-one thousand, two hundred one".