1156560997 has 2 divisors, whose sum is σ = 1156560998. Its totient is φ = 1156560996.

The previous prime is 1156560991. The next prime is 1156561019. The reversal of 1156560997 is 7990656511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1065434881 + 91126116 = 32641^2 + 9546^2 .

It is a cyclic number.

It is not a de Polignac number, because 1156560997 - 2¹⁵ = 1156528229 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1156560997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1156560991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578280498 + 578280499.

It is an arithmetic number, because the mean of its divisors is an integer number (578280499).

Almost surely, 2^1156560997 is an apocalyptic number.

It is an amenable number.

1156560997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1156560997 is an equidigital number, since it uses as much as digits as its factorization.

1156560997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 510300, while the sum is 49.

The square root of 1156560997 is about 34008.2489552167. The cubic root of 1156560997 is about 1049.6782073618.

The spelling of 1156560997 in words is "one billion, one hundred fifty-six million, five hundred sixty thousand, nine hundred ninety-seven".