121131009 has 6 divisors (see below), whose sum is σ = 174967026. Its totient is φ = 80754000.

The previous prime is 121130983. The next prime is 121131011. The reversal of 121131009 is 900131121.

It can be written as a sum of positive squares in only one way, i.e., 95121009 + 26010000 = 9753^2 + 5100^2 .

It is not a de Polignac number, because 121131009 - 2⁷ = 121130881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121130982 and 121131000.

It is not an unprimeable number, because it can be changed into a prime (121131019) 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, 6729492 + ... + 6729509.

It is an arithmetic number, because the mean of its divisors is an integer number (29161171).

Almost surely, 2^121131009 is an apocalyptic number.

It is an amenable number.

121131009 is a deficient number, since it is larger than the sum of its proper divisors (53836017).

121131009 is a wasteful number, since it uses less digits than its factorization.

121131009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13459007 (or 13459004 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 121131009 is about 11005.9533435319. The cubic root of 121131009 is about 494.7871873688.

The spelling of 121131009 in words is "one hundred twenty-one million, one hundred thirty-one thousand, nine".