1165211791 has 2 divisors, whose sum is σ = 1165211792. Its totient is φ = 1165211790.

The previous prime is 1165211779. The next prime is 1165211863. The reversal of 1165211791 is 1971125611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1165211791 - 2²¹ = 1163114639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1165211701) 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, 582605895 + 582605896.

It is an arithmetic number, because the mean of its divisors is an integer number (582605896).

Almost surely, 2^1165211791 is an apocalyptic number.

1165211791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1165211791 is an equidigital number, since it uses as much as digits as its factorization.

1165211791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 34.

The square root of 1165211791 is about 34135.1987104221. The cubic root of 1165211791 is about 1052.2888214943.

The spelling of 1165211791 in words is "one billion, one hundred sixty-five million, two hundred eleven thousand, seven hundred ninety-one".