120756409 has 2 divisors, whose sum is σ = 120756410. Its totient is φ = 120756408.

The previous prime is 120756407. The next prime is 120756437. The reversal of 120756409 is 904657021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117505600 + 3250809 = 10840^2 + 1803^2 .

It is an emirp because it is prime and its reverse (904657021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120756409 - 2¹ = 120756407 is a prime.

It is a super-2 number, since 2×120756409² = 29164220629150562, which contains 22 as substring.

Together with 120756407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (120756403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60378204 + 60378205.

It is an arithmetic number, because the mean of its divisors is an integer number (60378205).

Almost surely, 2^120756409 is an apocalyptic number.

It is an amenable number.

120756409 is a deficient number, since it is larger than the sum of its proper divisors (1).

120756409 is an equidigital number, since it uses as much as digits as its factorization.

120756409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 120756409 is about 10988.9221036460. The cubic root of 120756409 is about 494.2766143559.

The spelling of 120756409 in words is "one hundred twenty million, seven hundred fifty-six thousand, four hundred nine".