1202120109 has 20 divisors (see below), whose sum is σ = 1801463004. Its totient is φ = 798868224.

The previous prime is 1202120089. The next prime is 1202120119. The reversal of 1202120109 is 9010212021.

It can be written as a sum of positive squares in 2 ways, for example, as 432224100 + 769896009 = 20790^2 + 27747^2 .

It is not a de Polignac number, because 1202120109 - 2¹⁷ = 1201989037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1202120091 and 1202120100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202120119) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2269 + ... + 49085.

Almost surely, 2^1202120109 is an apocalyptic number.

It is an amenable number.

1202120109 is a deficient number, since it is larger than the sum of its proper divisors (599342895).

1202120109 is an equidigital number, since it uses as much as digits as its factorization.

1202120109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47146 (or 47137 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 1202120109 is about 34671.6037846535. The cubic root of 1202120109 is about 1063.2840209856.

The spelling of 1202120109 in words is "one billion, two hundred two million, one hundred twenty thousand, one hundred nine".