1201000001909 has 2 divisors, whose sum is σ = 1201000001910. Its totient is φ = 1201000001908.

The previous prime is 1201000001899. The next prime is 1201000002049. The reversal of 1201000001909 is 9091000001021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 933778207684 + 267221794225 = 966322^2 + 516935^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201000001909 - 2²⁸ = 1200731566453 is a prime.

It is a super-3 number, since 3×1201000001909³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201000001209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600500000954 + 600500000955.

It is an arithmetic number, because the mean of its divisors is an integer number (600500000955).

Almost surely, 2^{1201000001909} is an apocalyptic number.

It is an amenable number.

1201000001909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201000001909 is an equidigital number, since it uses as much as digits as its factorization.

1201000001909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 23.

The spelling of 1201000001909 in words is "one trillion, two hundred one billion, one thousand, nine hundred nine".