1156100009 has 2 divisors, whose sum is σ = 1156100010. Its totient is φ = 1156100008.

The previous prime is 1156100003. The next prime is 1156100027. The reversal of 1156100009 is 9000016511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 928542784 + 227557225 = 30472^2 + 15085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1156100009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1156100003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578050004 + 578050005.

It is an arithmetic number, because the mean of its divisors is an integer number (578050005).

Almost surely, 2^1156100009 is an apocalyptic number.

It is an amenable number.

1156100009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1156100009 is an equidigital number, since it uses as much as digits as its factorization.

1156100009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 1156100009 is about 34001.4706887805. The cubic root of 1156100009 is about 1049.5387267916.

The spelling of 1156100009 in words is "one billion, one hundred fifty-six million, one hundred thousand, nine".