165279791 has 2 divisors, whose sum is σ = 165279792. Its totient is φ = 165279790.

The previous prime is 165279781. The next prime is 165279799. The reversal of 165279791 is 197972561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165279791 - 2¹⁴ = 165263407 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165279799) 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, 82639895 + 82639896.

It is an arithmetic number, because the mean of its divisors is an integer number (82639896).

Almost surely, 2^165279791 is an apocalyptic number.

165279791 is a deficient number, since it is larger than the sum of its proper divisors (1).

165279791 is an equidigital number, since it uses as much as digits as its factorization.

165279791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 238140, while the sum is 47.

The square root of 165279791 is about 12856.1188155679. The cubic root of 165279791 is about 548.7905002772.

The spelling of 165279791 in words is "one hundred sixty-five million, two hundred seventy-nine thousand, seven hundred ninety-one".