161061520 has 40 divisors (see below), whose sum is σ = 378692280. Its totient is φ = 63697920.

The previous prime is 161061517. The next prime is 161061521. The reversal of 161061520 is 25160161.

161061520 is digitally balanced in base 3, 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 4 ways, for example, as 33732864 + 127328656 = 5808^2 + 11284^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 161061491 and 161061500.

It is not an unprimeable number, because it can be changed into a prime (161061521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4191 + ... + 18430.

It is an arithmetic number, because the mean of its divisors is an integer number (9467307).

Almost surely, 2^161061520 is an apocalyptic number.

161061520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161061520 is an abundant number, since it is smaller than the sum of its proper divisors (217630760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161061520 is a wasteful number, since it uses less digits than its factorization.

161061520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22723 (or 22717 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 161061520 is about 12691.0015365219. The cubic root of 161061520 is about 544.0814648760.

The spelling of 161061520 in words is "one hundred sixty-one million, sixty-one thousand, five hundred twenty".