1200901109 has 4 divisors (see below), whose sum is σ = 1201132620. Its totient is φ = 1200669600.

The previous prime is 1200901103. The next prime is 1200901123. The reversal of 1200901109 is 9011090021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9011090021 = 59581 ⋅151241.

It can be written as a sum of positive squares in 2 ways, for example, as 574800625 + 626100484 = 23975^2 + 25022^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200901109 - 2⁸ = 1200900853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200901103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107792 + ... + 118409.

It is an arithmetic number, because the mean of its divisors is an integer number (300283155).

Almost surely, 2^1200901109 is an apocalyptic number.

It is an amenable number.

1200901109 is a deficient number, since it is larger than the sum of its proper divisors (231511).

1200901109 is an equidigital number, since it uses as much as digits as its factorization.

1200901109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231510.

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

The square root of 1200901109 is about 34654.0200986841. The cubic root of 1200901109 is about 1062.9244946306.

The spelling of 1200901109 in words is "one billion, two hundred million, nine hundred one thousand, one hundred nine".