162156121 has 2 divisors, whose sum is σ = 162156122. Its totient is φ = 162156120.

The previous prime is 162156109. The next prime is 162156143. The reversal of 162156121 is 121651261.

It is a happy number.

162156121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144000000 + 18156121 = 12000^2 + 4261^2 .

It is an emirp because it is prime and its reverse (121651261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 162156121 - 2⁷ = 162155993 is a prime.

It is not a weakly prime, because it can be changed into another prime (162156151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81078060 + 81078061.

It is an arithmetic number, because the mean of its divisors is an integer number (81078061).

Almost surely, 2^162156121 is an apocalyptic number.

It is an amenable number.

162156121 is a deficient number, since it is larger than the sum of its proper divisors (1).

162156121 is an equidigital number, since it uses as much as digits as its factorization.

162156121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 25.

The square root of 162156121 is about 12734.0535965575. The cubic root of 162156121 is about 545.3112393317.

The spelling of 162156121 in words is "one hundred sixty-two million, one hundred fifty-six thousand, one hundred twenty-one".