162318721 has 4 divisors (see below), whose sum is σ = 162445744. Its totient is φ = 162191700.

The previous prime is 162318719. The next prime is 162318731. The reversal of 162318721 is 127813261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 162318721 - 2¹ = 162318719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (162318731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61575 + ... + 64156.

It is an arithmetic number, because the mean of its divisors is an integer number (40611436).

Almost surely, 2^162318721 is an apocalyptic number.

It is an amenable number.

162318721 is a deficient number, since it is larger than the sum of its proper divisors (127023).

162318721 is a wasteful number, since it uses less digits than its factorization.

162318721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127022.

The product of its digits is 4032, while the sum is 31.

The square root of 162318721 is about 12740.4364524925. The cubic root of 162318721 is about 545.4934464268.

The spelling of 162318721 in words is "one hundred sixty-two million, three hundred eighteen thousand, seven hundred twenty-one".