2009875121 has 4 divisors (see below), whose sum is σ = 2012530932. Its totient is φ = 2007219312.

The previous prime is 2009875097. The next prime is 2009875123. The reversal of 2009875121 is 1215789002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1215789002 = 2 ⋅607894501.

It can be written as a sum of positive squares in 2 ways, for example, as 737882896 + 1271992225 = 27164^2 + 35665^2 .

It is a cyclic number.

It is not a de Polignac number, because 2009875121 - 2⁶ = 2009875057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2009875123) 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, 1326770 + ... + 1328283.

It is an arithmetic number, because the mean of its divisors is an integer number (503132733).

Almost surely, 2^2009875121 is an apocalyptic number.

It is an amenable number.

2009875121 is a deficient number, since it is larger than the sum of its proper divisors (2655811).

2009875121 is an equidigital number, since it uses as much as digits as its factorization.

2009875121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2655810.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 2009875121 is about 44831.6308090616. The cubic root of 2009875121 is about 1261.9912917791.

The spelling of 2009875121 in words is "two billion, nine million, eight hundred seventy-five thousand, one hundred twenty-one".