161304518 has 4 divisors (see below), whose sum is σ = 241956780. Its totient is φ = 80652258.

The previous prime is 161304511. The next prime is 161304527. The reversal of 161304518 is 815403161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 815403161 = 79 ⋅10321559.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161304511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40326128 + ... + 40326131.

It is an arithmetic number, because the mean of its divisors is an integer number (60489195).

Almost surely, 2^161304518 is an apocalyptic number.

161304518 is a deficient number, since it is larger than the sum of its proper divisors (80652262).

161304518 is an equidigital number, since it uses as much as digits as its factorization.

161304518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80652261.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 161304518 is about 12700.5715619416. The cubic root of 161304518 is about 544.3549510021.

Adding to 161304518 its reverse (815403161), we get a palindrome (976707679).

The spelling of 161304518 in words is "one hundred sixty-one million, three hundred four thousand, five hundred eighteen".