161395272 has 48 divisors (see below), whose sum is σ = 460122000. Its totient is φ = 50966496.

The previous prime is 161395261. The next prime is 161395279. The reversal of 161395272 is 272593161.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (161395279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57622 + ... + 60357.

It is an arithmetic number, because the mean of its divisors is an integer number (9585875).

Almost surely, 2^161395272 is an apocalyptic number.

161395272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161395272 is an abundant number, since it is smaller than the sum of its proper divisors (298726728).

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

161395272 is a wasteful number, since it uses less digits than its factorization.

161395272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118010 (or 118003 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 161395272 is about 12704.1438908728. The cubic root of 161395272 is about 544.4570211481.

The spelling of 161395272 in words is "one hundred sixty-one million, three hundred ninety-five thousand, two hundred seventy-two".