162157909 has 2 divisors, whose sum is σ = 162157910. Its totient is φ = 162157908.

The previous prime is 162157903. The next prime is 162157927. The reversal of 162157909 is 909751261.

162157909 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., 149377284 + 12780625 = 12222^2 + 3575^2 .

It is an emirp because it is prime and its reverse (909751261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 162157909 - 2²⁵ = 128603477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (162157903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81078954 + 81078955.

It is an arithmetic number, because the mean of its divisors is an integer number (81078955).

Almost surely, 2^162157909 is an apocalyptic number.

It is an amenable number.

162157909 is a deficient number, since it is larger than the sum of its proper divisors (1).

162157909 is an equidigital number, since it uses as much as digits as its factorization.

162157909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 40.

The square root of 162157909 is about 12734.1238018169. The cubic root of 162157909 is about 545.3132435996.

The spelling of 162157909 in words is "one hundred sixty-two million, one hundred fifty-seven thousand, nine hundred nine".