161982525 has 12 divisors (see below), whose sum is σ = 267811232. Its totient is φ = 86390640.

The previous prime is 161982521. The next prime is 161982529. The reversal of 161982525 is 525289161.

It is an interprime number because it is at equal distance from previous prime (161982521) and next prime (161982529).

It is not a de Polignac number, because 161982525 - 2² = 161982521 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161982521) 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, 1079809 + ... + 1079958.

Almost surely, 2^161982525 is an apocalyptic number.

161982525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161982525 is a deficient number, since it is larger than the sum of its proper divisors (105828707).

161982525 is a wasteful number, since it uses less digits than its factorization.

161982525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159780 (or 2159775 counting only the distinct ones).

The product of its digits is 43200, while the sum is 39.

The square root of 161982525 is about 12727.2355600107. The cubic root of 161982525 is about 545.1165757977.

The spelling of 161982525 in words is "one hundred sixty-one million, nine hundred eighty-two thousand, five hundred twenty-five".