165391213 has 8 divisors (see below), whose sum is σ = 178214400. Its totient is φ = 152582448.

The previous prime is 165391199. The next prime is 165391223. The reversal of 165391213 is 312193561.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165391213 - 2¹⁷ = 165260141 is a prime.

It is a super-2 number, since 2×165391213² = 54708506675222738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165391223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38508 + ... + 42586.

It is an arithmetic number, because the mean of its divisors is an integer number (22276800).

Almost surely, 2^165391213 is an apocalyptic number.

165391213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

165391213 is a deficient number, since it is larger than the sum of its proper divisors (12823187).

165391213 is a wasteful number, since it uses less digits than its factorization.

165391213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7211.

The product of its digits is 4860, while the sum is 31.

The square root of 165391213 is about 12860.4515084036. The cubic root of 165391213 is about 548.9137934301.

The spelling of 165391213 in words is "one hundred sixty-five million, three hundred ninety-one thousand, two hundred thirteen".