161245272 has 64 divisors (see below), whose sum is σ = 445409280. Its totient is φ = 48384512.

The previous prime is 161245211. The next prime is 161245283. The reversal of 161245272 is 272542161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 793 + ... + 17975.

It is an arithmetic number, because the mean of its divisors is an integer number (6959520).

Almost surely, 2^161245272 is an apocalyptic number.

161245272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161245272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222704640).

161245272 is an abundant number, since it is smaller than the sum of its proper divisors (284164008).

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

161245272 is a wasteful number, since it uses less digits than its factorization.

161245272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17232 (or 17228 counting only the distinct ones).

The product of its digits is 6720, while the sum is 30.

The square root of 161245272 is about 12698.2389330174. The cubic root of 161245272 is about 544.2882969428.

The spelling of 161245272 in words is "one hundred sixty-one million, two hundred forty-five thousand, two hundred seventy-two".