161973459 has 16 divisors (see below), whose sum is σ = 244490400. Its totient is φ = 105943968.

The previous prime is 161973451. The next prime is 161973473. The reversal of 161973459 is 954379161.

161973459 is a `hidden beast` number, since 1 + 6 + 197 + 3 + 459 = 666.

161973459 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161973459 - 2³ = 161973451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161973451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55164 + ... + 58025.

It is an arithmetic number, because the mean of its divisors is an integer number (15280650).

Almost surely, 2^161973459 is an apocalyptic number.

161973459 is a deficient number, since it is larger than the sum of its proper divisors (82516941).

161973459 is a wasteful number, since it uses less digits than its factorization.

161973459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113251 (or 113245 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 161973459 is about 12726.8793897012. The cubic root of 161973459 is about 545.1064057313.

It can be divided in two parts, 1619 and 73459, that added together give a triangular number (75078 = T₃₈₇).

The spelling of 161973459 in words is "one hundred sixty-one million, nine hundred seventy-three thousand, four hundred fifty-nine".