165213601 has 32 divisors (see below), whose sum is σ = 202309632. Its totient is φ = 131950080.

The previous prime is 165213563. The next prime is 165213647. The reversal of 165213601 is 106312561.

It is a cyclic number.

It is not a de Polignac number, because 165213601 - 2¹⁵ = 165180833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165213661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 989220 + ... + 989386.

It is an arithmetic number, because the mean of its divisors is an integer number (6322176).

Almost surely, 2^165213601 is an apocalyptic number.

It is an amenable number.

165213601 is a deficient number, since it is larger than the sum of its proper divisors (37096031).

165213601 is a wasteful number, since it uses less digits than its factorization.

165213601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 165213601 is about 12853.5442971968. The cubic root of 165213601 is about 548.7172320068.

The spelling of 165213601 in words is "one hundred sixty-five million, two hundred thirteen thousand, six hundred one".