161973461 has 16 divisors (see below), whose sum is σ = 184679040. Its totient is φ = 140823360.

The previous prime is 161973451. The next prime is 161973473. The reversal of 161973461 is 164379161.

It is a happy number.

161973461 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 161973461 - 2¹⁴ = 161957077 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161973401) 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, 42896 + ... + 46518.

It is an arithmetic number, because the mean of its divisors is an integer number (11542440).

Almost surely, 2^161973461 is an apocalyptic number.

It is an amenable number.

161973461 is a deficient number, since it is larger than the sum of its proper divisors (22705579).

161973461 is a wasteful number, since it uses less digits than its factorization.

161973461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3836.

The product of its digits is 27216, while the sum is 38.

The square root of 161973461 is about 12726.8794682750. The cubic root of 161973461 is about 545.1064079749.

The spelling of 161973461 in words is "one hundred sixty-one million, nine hundred seventy-three thousand, four hundred sixty-one".