162161561 has 6 divisors (see below), whose sum is σ = 171145962. Its totient is φ = 153626400.

The previous prime is 162161551. The next prime is 162161563. The reversal of 162161561 is 165161261.

162161561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 147865600 + 14295961 = 12160^2 + 3781^2 .

It is a de Polignac number, because none of the positive numbers 2^k-162161561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (162161563) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 224240 + ... + 224961.

It is an arithmetic number, because the mean of its divisors is an integer number (28524327).

Almost surely, 2^162161561 is an apocalyptic number.

It is an amenable number.

162161561 is a deficient number, since it is larger than the sum of its proper divisors (8984401).

162161561 is an equidigital number, since it uses as much as digits as its factorization.

162161561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449239 (or 449220 counting only the distinct ones).

The product of its digits is 2160, while the sum is 29.

The square root of 162161561 is about 12734.2671952492. The cubic root of 162161561 is about 545.3173372822.

The spelling of 162161561 in words is "one hundred sixty-two million, one hundred sixty-one thousand, five hundred sixty-one".