1156917409 has 2 divisors, whose sum is σ = 1156917410. Its totient is φ = 1156917408.

The previous prime is 1156917403. The next prime is 1156917413. The reversal of 1156917409 is 9047196511.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1059697809 + 97219600 = 32553^2 + 9860^2 .

It is a cyclic number.

It is not a de Polignac number, because 1156917409 - 2³ = 1156917401 is a prime.

It is not a weakly prime, because it can be changed into another prime (1156917401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578458704 + 578458705.

It is an arithmetic number, because the mean of its divisors is an integer number (578458705).

Almost surely, 2^1156917409 is an apocalyptic number.

It is an amenable number.

1156917409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1156917409 is an equidigital number, since it uses as much as digits as its factorization.

1156917409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 43.

The square root of 1156917409 is about 34013.4886331879. The cubic root of 1156917409 is about 1049.7860210978.

The spelling of 1156917409 in words is "one billion, one hundred fifty-six million, nine hundred seventeen thousand, four hundred nine".