165812201 has 2 divisors, whose sum is σ = 165812202. Its totient is φ = 165812200.

The previous prime is 165812191. The next prime is 165812233. The reversal of 165812201 is 102218561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164454976 + 1357225 = 12824^2 + 1165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165812201 is a prime.

It is not a weakly prime, because it can be changed into another prime (165812291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82906100 + 82906101.

It is an arithmetic number, because the mean of its divisors is an integer number (82906101).

Almost surely, 2^165812201 is an apocalyptic number.

It is an amenable number.

165812201 is a deficient number, since it is larger than the sum of its proper divisors (1).

165812201 is an equidigital number, since it uses as much as digits as its factorization.

165812201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 165812201 is about 12876.8086496616. The cubic root of 165812201 is about 549.3791352162.

The spelling of 165812201 in words is "one hundred sixty-five million, eight hundred twelve thousand, two hundred one".