1201221961 has 2 divisors, whose sum is σ = 1201221962. Its totient is φ = 1201221960.

The previous prime is 1201221953. The next prime is 1201222027. The reversal of 1201221961 is 1691221021.

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., 717221961 + 484000000 = 26781^2 + 22000^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201221961 - 2³ = 1201221953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201201961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600610980 + 600610981.

It is an arithmetic number, because the mean of its divisors is an integer number (600610981).

Almost surely, 2^1201221961 is an apocalyptic number.

It is an amenable number.

1201221961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201221961 is an equidigital number, since it uses as much as digits as its factorization.

1201221961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1201221961 is about 34658.6491514023. The cubic root of 1201221961 is about 1063.0191488529.

Adding to 1201221961 its reverse (1691221021), we get a palindrome (2892442982).

The spelling of 1201221961 in words is "one billion, two hundred one million, two hundred twenty-one thousand, nine hundred sixty-one".