165021097 has 2 divisors, whose sum is σ = 165021098. Its totient is φ = 165021096.

The previous prime is 165021083. The next prime is 165021121. The reversal of 165021097 is 790120561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142468096 + 22553001 = 11936^2 + 4749^2 .

It is an emirp because it is prime and its reverse (790120561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165021097 is a prime.

It is not a weakly prime, because it can be changed into another prime (165021497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82510548 + 82510549.

It is an arithmetic number, because the mean of its divisors is an integer number (82510549).

Almost surely, 2^165021097 is an apocalyptic number.

It is an amenable number.

165021097 is a deficient number, since it is larger than the sum of its proper divisors (1).

165021097 is an equidigital number, since it uses as much as digits as its factorization.

165021097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 165021097 is about 12846.0537520283. The cubic root of 165021097 is about 548.5040306034.

The spelling of 165021097 in words is "one hundred sixty-five million, twenty-one thousand, ninety-seven".