165001391 has 2 divisors, whose sum is σ = 165001392. Its totient is φ = 165001390.

The previous prime is 165001381. The next prime is 165001423. The reversal of 165001391 is 193100561.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165001391 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165001391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165001351) 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, 82500695 + 82500696.

It is an arithmetic number, because the mean of its divisors is an integer number (82500696).

Almost surely, 2^165001391 is an apocalyptic number.

165001391 is a deficient number, since it is larger than the sum of its proper divisors (1).

165001391 is an equidigital number, since it uses as much as digits as its factorization.

165001391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 165001391 is about 12845.2867231526. The cubic root of 165001391 is about 548.4821965250.

The spelling of 165001391 in words is "one hundred sixty-five million, one thousand, three hundred ninety-one".