50121009 has 6 divisors (see below), whose sum is σ = 72397026. Its totient is φ = 33414000.

The previous prime is 50121007. The next prime is 50121023. The reversal of 50121009 is 90012105.

It can be written as a sum of positive squares in only one way, i.e., 38750625 + 11370384 = 6225^2 + 3372^2 .

It is not a de Polignac number, because 50121009 - 2¹ = 50121007 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 50120982 and 50121000.

It is not an unprimeable number, because it can be changed into a prime (50121007) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2784492 + ... + 2784509.

It is an arithmetic number, because the mean of its divisors is an integer number (12066171).

Almost surely, 2^50121009 is an apocalyptic number.

It is an amenable number.

50121009 is a deficient number, since it is larger than the sum of its proper divisors (22276017).

50121009 is a wasteful number, since it uses less digits than its factorization.

50121009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5569007 (or 5569004 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 50121009 is about 7079.6192694240. The cubic root of 50121009 is about 368.7001110713.

The spelling of 50121009 in words is "fifty million, one hundred twenty-one thousand, nine".