1201310989 has 2 divisors, whose sum is σ = 1201310990. Its totient is φ = 1201310988.

The previous prime is 1201310963. The next prime is 1201311017. The reversal of 1201310989 is 9890131021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1169298025 + 32012964 = 34195^2 + 5658^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201310989 - 2⁹ = 1201310477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201310959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600655494 + 600655495.

It is an arithmetic number, because the mean of its divisors is an integer number (600655495).

Almost surely, 2^1201310989 is an apocalyptic number.

It is an amenable number.

1201310989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201310989 is an equidigital number, since it uses as much as digits as its factorization.

1201310989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1201310989 is about 34659.9334823366. The cubic root of 1201310989 is about 1063.0454099254.

The spelling of 1201310989 in words is "one billion, two hundred one million, three hundred ten thousand, nine hundred eighty-nine".