1201216901 has 2 divisors, whose sum is σ = 1201216902. Its totient is φ = 1201216900.

The previous prime is 1201216873. The next prime is 1201216943. The reversal of 1201216901 is 1096121021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1108557025 + 92659876 = 33295^2 + 9626^2 .

It is an emirp because it is prime and its reverse (1096121021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201216901 - 2³⁰ = 127475077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201218901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600608450 + 600608451.

It is an arithmetic number, because the mean of its divisors is an integer number (600608451).

Almost surely, 2^1201216901 is an apocalyptic number.

It is an amenable number.

1201216901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201216901 is an equidigital number, since it uses as much as digits as its factorization.

1201216901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 1201216901 is about 34658.5761536737. The cubic root of 1201216901 is about 1063.0176562383.

Adding to 1201216901 its reverse (1096121021), we get a palindrome (2297337922).

The spelling of 1201216901 in words is "one billion, two hundred one million, two hundred sixteen thousand, nine hundred one".