165945397 has 2 divisors, whose sum is σ = 165945398. Its totient is φ = 165945396.

The previous prime is 165945349. The next prime is 165945413. The reversal of 165945397 is 793549561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116510436 + 49434961 = 10794^2 + 7031^2 .

It is a cyclic number.

It is not a de Polignac number, because 165945397 - 2²⁷ = 31727669 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165945397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165945317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82972698 + 82972699.

It is an arithmetic number, because the mean of its divisors is an integer number (82972699).

Almost surely, 2^165945397 is an apocalyptic number.

It is an amenable number.

165945397 is a deficient number, since it is larger than the sum of its proper divisors (1).

165945397 is an equidigital number, since it uses as much as digits as its factorization.

165945397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1020600, while the sum is 49.

The square root of 165945397 is about 12881.9795450855. The cubic root of 165945397 is about 549.5262002249.

The spelling of 165945397 in words is "one hundred sixty-five million, nine hundred forty-five thousand, three hundred ninety-seven".