1202120009 has 4 divisors (see below), whose sum is σ = 1203307716. Its totient is φ = 1200932304.

The previous prime is 1202119999. The next prime is 1202120021. The reversal of 1202120009 is 9000212021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9000212021 = 563 ⋅15986167.

It can be written as a sum of positive squares in 2 ways, for example, as 13801225 + 1188318784 = 3715^2 + 34472^2 .

It is a cyclic number.

It is not a de Polignac number, because 1202120009 - 2¹⁶ = 1202054473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1202120089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 592334 + ... + 594359.

It is an arithmetic number, because the mean of its divisors is an integer number (300826929).

Almost surely, 2^1202120009 is an apocalyptic number.

It is an amenable number.

1202120009 is a deficient number, since it is larger than the sum of its proper divisors (1187707).

1202120009 is a wasteful number, since it uses less digits than its factorization.

1202120009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187706.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1202120009 is about 34671.6023425512. The cubic root of 1202120009 is about 1063.2839915020.

The spelling of 1202120009 in words is "one billion, two hundred two million, one hundred twenty thousand, nine".