161972 has 6 divisors (see below), whose sum is σ = 283458. Its totient is φ = 80984.

The previous prime is 161971. The next prime is 161977. The reversal of 161972 is 279161.

161972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 106276 + 55696 = 326^2 + 236^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20243 + ... + 20250.

It is an arithmetic number, because the mean of its divisors is an integer number (47243).

2¹⁶¹⁹⁷² is an apocalyptic number.

It is an amenable number.

161972 is a deficient number, since it is larger than the sum of its proper divisors (121486).

161972 is a wasteful number, since it uses less digits than its factorization.

161972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40497 (or 40495 counting only the distinct ones).

The product of its digits is 756, while the sum is 26.

The square root of 161972 is about 402.4574511672. The cubic root of 161972 is about 54.5104769017.

The spelling of 161972 in words is "one hundred sixty-one thousand, nine hundred seventy-two".