161973598 has 4 divisors (see below), whose sum is σ = 242960400. Its totient is φ = 80986798.

The previous prime is 161973583. The next prime is 161973601. The reversal of 161973598 is 895379161.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40493398 + ... + 40493401.

It is an arithmetic number, because the mean of its divisors is an integer number (60740100).

Almost surely, 2^161973598 is an apocalyptic number.

161973598 is a deficient number, since it is larger than the sum of its proper divisors (80986802).

161973598 is an equidigital number, since it uses as much as digits as its factorization.

161973598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80986801.

The product of its digits is 408240, while the sum is 49.

The square root of 161973598 is about 12726.8848505830. The cubic root of 161973598 is about 545.1065616617.

The spelling of 161973598 in words is "one hundred sixty-one million, nine hundred seventy-three thousand, five hundred ninety-eight".