1165547213 has 2 divisors, whose sum is σ = 1165547214. Its totient is φ = 1165547212.

The previous prime is 1165547197. The next prime is 1165547231. The reversal of 1165547213 is 3127455611.

It is a happy number.

Together with next prime (1165547231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1108423849 + 57123364 = 33293^2 + 7558^2 .

It is a cyclic number.

It is not a de Polignac number, because 1165547213 - 2⁴ = 1165547197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1165547263) 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, 582773606 + 582773607.

It is an arithmetic number, because the mean of its divisors is an integer number (582773607).

Almost surely, 2^1165547213 is an apocalyptic number.

It is an amenable number.

1165547213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165547213 is an equidigital number, since it uses as much as digits as its factorization.

1165547213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 35.

The square root of 1165547213 is about 34140.1114965959. Note that the first 3 decimals coincide. The cubic root of 1165547213 is about 1052.3897836716.

The spelling of 1165547213 in words is "one billion, one hundred sixty-five million, five hundred forty-seven thousand, two hundred thirteen".