1209201001 has 2 divisors, whose sum is σ = 1209201002. Its totient is φ = 1209201000.

The previous prime is 1209200953. The next prime is 1209201017. The reversal of 1209201001 is 1001029021.

It is an a-pointer prime, because the next prime (1209201017) can be obtained adding 1209201001 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 930311001 + 278890000 = 30501^2 + 16700^2 .

It is a cyclic number.

It is not a de Polignac number, because 1209201001 - 2¹¹ = 1209198953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1209201031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604600500 + 604600501.

It is an arithmetic number, because the mean of its divisors is an integer number (604600501).

Almost surely, 2^1209201001 is an apocalyptic number.

It is an amenable number.

1209201001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209201001 is an equidigital number, since it uses as much as digits as its factorization.

1209201001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 1209201001 is about 34773.5675621585. The cubic root of 1209201001 is about 1065.3676355007.

The spelling of 1209201001 in words is "one billion, two hundred nine million, two hundred one thousand, one".