162132721 has 4 divisors (see below), whose sum is σ = 162537444. Its totient is φ = 161728000.

The previous prime is 162132703. The next prime is 162132731. The reversal of 162132721 is 127231261.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 76755121 + 85377600 = 8761^2 + 9240^2 .

It is a cyclic number.

It is not a de Polignac number, because 162132721 - 2⁹ = 162132209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (162132731) 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, 201760 + ... + 202561.

It is an arithmetic number, because the mean of its divisors is an integer number (40634361).

Almost surely, 2^162132721 is an apocalyptic number.

It is an amenable number.

162132721 is a deficient number, since it is larger than the sum of its proper divisors (404723).

162132721 is an equidigital number, since it uses as much as digits as its factorization.

162132721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404722.

The product of its digits is 1008, while the sum is 25.

The square root of 162132721 is about 12733.1347672127. The cubic root of 162132721 is about 545.2850076221.

Adding to 162132721 its reverse (127231261), we get a palindrome (289363982).

The spelling of 162132721 in words is "one hundred sixty-two million, one hundred thirty-two thousand, seven hundred twenty-one".