161517025 has 12 divisors (see below), whose sum is σ = 205695292. Its totient is φ = 125720640.

The previous prime is 161517019. The next prime is 161517029. The reversal of 161517025 is 520715161.

It can be written as a sum of positive squares in 6 ways, for example, as 2782224 + 158734801 = 1668^2 + 12599^2 .

It is not a de Polignac number, because 161517025 - 2⁷ = 161516897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161516984 and 161517002.

It is not an unprimeable number, because it can be changed into a prime (161517029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 86382 + ... + 88231.

Almost surely, 2^161517025 is an apocalyptic number.

It is an amenable number.

161517025 is a deficient number, since it is larger than the sum of its proper divisors (44178267).

161517025 is a wasteful number, since it uses less digits than its factorization.

161517025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174660 (or 174655 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 28.

The square root of 161517025 is about 12708.9348491524. The cubic root of 161517025 is about 544.5938954873.

The spelling of 161517025 in words is "one hundred sixty-one million, five hundred seventeen thousand, twenty-five".