120781009 has 2 divisors, whose sum is σ = 120781010. Its totient is φ = 120781008.

The previous prime is 120781007. The next prime is 120781013. The reversal of 120781009 is 900187021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81993025 + 38787984 = 9055^2 + 6228^2 .

It is a cyclic number.

It is not a de Polignac number, because 120781009 - 2¹ = 120781007 is a prime.

Together with 120781007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (120781007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60390504 + 60390505.

It is an arithmetic number, because the mean of its divisors is an integer number (60390505).

Almost surely, 2^120781009 is an apocalyptic number.

It is an amenable number.

120781009 is a deficient number, since it is larger than the sum of its proper divisors (1).

120781009 is an equidigital number, since it uses as much as digits as its factorization.

120781009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 120781009 is about 10990.0413557002. The cubic root of 120781009 is about 494.3101760780.

The spelling of 120781009 in words is "one hundred twenty million, seven hundred eighty-one thousand, nine".