161629318 has 4 divisors (see below), whose sum is σ = 242443980. Its totient is φ = 80814658.

The previous prime is 161629313. The next prime is 161629331. The reversal of 161629318 is 813926161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 813926161 = 19 ⋅42838219.

It is a super-2 number, since 2×161629318² = 52248072874290248, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161629313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40407328 + ... + 40407331.

It is an arithmetic number, because the mean of its divisors is an integer number (60610995).

Almost surely, 2^161629318 is an apocalyptic number.

161629318 is a deficient number, since it is larger than the sum of its proper divisors (80814662).

161629318 is an equidigital number, since it uses as much as digits as its factorization.

161629318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80814661.

The product of its digits is 15552, while the sum is 37.

The square root of 161629318 is about 12713.3519576861. The cubic root of 161629318 is about 544.7200739620.

The spelling of 161629318 in words is "one hundred sixty-one million, six hundred twenty-nine thousand, three hundred eighteen".