1181409913 has 2 divisors, whose sum is σ = 1181409914. Its totient is φ = 1181409912.

The previous prime is 1181409863. The next prime is 1181409919. The reversal of 1181409913 is 3199041811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1178068329 + 3341584 = 34323^2 + 1828^2 .

It is a cyclic number.

It is not a de Polignac number, because 1181409913 - 2⁹ = 1181409401 is a prime.

It is not a weakly prime, because it can be changed into another prime (1181409919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 590704956 + 590704957.

It is an arithmetic number, because the mean of its divisors is an integer number (590704957).

Almost surely, 2^1181409913 is an apocalyptic number.

It is an amenable number.

1181409913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1181409913 is an equidigital number, since it uses as much as digits as its factorization.

1181409913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 37.

The square root of 1181409913 is about 34371.6440252718. The cubic root of 1181409913 is about 1057.1425094428.

The spelling of 1181409913 in words is "one billion, one hundred eighty-one million, four hundred nine thousand, nine hundred thirteen".