165312311 has 2 divisors, whose sum is σ = 165312312. Its totient is φ = 165312310.

The previous prime is 165312307. The next prime is 165312341. The reversal of 165312311 is 113213561.

It is a weak prime.

It is an emirp because it is prime and its reverse (113213561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165312311 - 2² = 165312307 is a prime.

It is a super-6 number, since 6×165312311⁶ (a number of 51 digits) contains 666666 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165312341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82656155 + 82656156.

It is an arithmetic number, because the mean of its divisors is an integer number (82656156).

Almost surely, 2^165312311 is an apocalyptic number.

165312311 is a deficient number, since it is larger than the sum of its proper divisors (1).

165312311 is an equidigital number, since it uses as much as digits as its factorization.

165312311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 540, while the sum is 23.

The square root of 165312311 is about 12857.3835207635. The cubic root of 165312311 is about 548.8264907565.

Adding to 165312311 its reverse (113213561), we get a palindrome (278525872).

The spelling of 165312311 in words is "one hundred sixty-five million, three hundred twelve thousand, three hundred eleven".