161020025 has 12 divisors (see below), whose sum is σ = 200384124. Its totient is φ = 128352000.

The previous prime is 161020021. The next prime is 161020037. The reversal of 161020025 is 520020161.

It can be written as a sum of positive squares in 6 ways, for example, as 719104 + 160300921 = 848^2 + 12661^2 .

It is not a de Polignac number, because 161020025 - 2² = 161020021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161019985 and 161020012.

It is not an unprimeable number, because it can be changed into a prime (161020021) 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, 4436 + ... + 18485.

It is an arithmetic number, because the mean of its divisors is an integer number (16698677).

Almost surely, 2^161020025 is an apocalyptic number.

It is an amenable number.

161020025 is a deficient number, since it is larger than the sum of its proper divisors (39364099).

161020025 is a wasteful number, since it uses less digits than its factorization.

161020025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23212 (or 23207 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 161020025 is about 12689.3666114586. The cubic root of 161020025 is about 544.0347361488.

Adding to 161020025 its reverse (520020161), we get a palindrome (681040186).

The spelling of 161020025 in words is "one hundred sixty-one million, twenty thousand, twenty-five".