1187166913 has 2 divisors, whose sum is σ = 1187166914. Its totient is φ = 1187166912.

The previous prime is 1187166901. The next prime is 1187166923. The reversal of 1187166913 is 3196617811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1106759824 + 80407089 = 33268^2 + 8967^2 .

It is a cyclic number.

It is not a de Polignac number, because 1187166913 - 2⁹ = 1187166401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1187166913.

It is not a weakly prime, because it can be changed into another prime (1187166923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593583456 + 593583457.

It is an arithmetic number, because the mean of its divisors is an integer number (593583457).

Almost surely, 2^1187166913 is an apocalyptic number.

It is an amenable number.

1187166913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1187166913 is an equidigital number, since it uses as much as digits as its factorization.

1187166913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 43.

The square root of 1187166913 is about 34455.2886071210. The cubic root of 1187166913 is about 1058.8568764352.

It can be divided in two parts, 1187 and 166913, that added together give a square (168100 = 410²).

The spelling of 1187166913 in words is "one billion, one hundred eighty-seven million, one hundred sixty-six thousand, nine hundred thirteen".