161504983 has 4 divisors (see below), whose sum is σ = 161698320. Its totient is φ = 161311648.

The previous prime is 161504977. The next prime is 161504999. The reversal of 161504983 is 389405161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 389405161 = 10627 ⋅36643.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161504983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161504923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95410 + ... + 97087.

It is an arithmetic number, because the mean of its divisors is an integer number (40424580).

Almost surely, 2^161504983 is an apocalyptic number.

161504983 is a deficient number, since it is larger than the sum of its proper divisors (193337).

161504983 is an equidigital number, since it uses as much as digits as its factorization.

161504983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193336.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 161504983 is about 12708.4610791394. The cubic root of 161504983 is about 544.5803609746.

The spelling of 161504983 in words is "one hundred sixty-one million, five hundred four thousand, nine hundred eighty-three".