1201221331 has 2 divisors, whose sum is σ = 1201221332. Its totient is φ = 1201221330.

The previous prime is 1201221313. The next prime is 1201221349. The reversal of 1201221331 is 1331221021.

Together with previous prime (1201221313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (1201221313) and next prime (1201221349).

It is a cyclic number.

It is not a de Polignac number, because 1201221331 - 2⁹ = 1201220819 is a prime.

It is a super-2 number, since 2×1201221331² = 2885865372098823122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1201221031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600610665 + 600610666.

It is an arithmetic number, because the mean of its divisors is an integer number (600610666).

Almost surely, 2^1201221331 is an apocalyptic number.

1201221331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201221331 is an equidigital number, since it uses as much as digits as its factorization.

1201221331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1201221331 is about 34658.6400627607. The cubic root of 1201221331 is about 1063.0189630138.

Adding to 1201221331 its reverse (1331221021), we get a palindrome (2532442352).

The spelling of 1201221331 in words is "one billion, two hundred one million, two hundred twenty-one thousand, three hundred thirty-one".