161934318 has 144 divisors (see below), whose sum is σ = 455626080. Its totient is φ = 41150592.

The previous prime is 161934313. The next prime is 161934323. The reversal of 161934318 is 813439161.

161934318 is a `hidden beast` number, since 1 + 619 + 3 + 4 + 31 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (161934313) and next prime (161934323).

It is a super-2 number, since 2×161934318² = 52445446692250248, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161934313) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 332271 + ... + 332757.

It is an arithmetic number, because the mean of its divisors is an integer number (3164070).

Almost surely, 2^161934318 is an apocalyptic number.

161934318 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161934318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227813040).

161934318 is an abundant number, since it is smaller than the sum of its proper divisors (293691762).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161934318 is a wasteful number, since it uses less digits than its factorization.

161934318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 541 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 161934318 is about 12725.3415671250. The cubic root of 161934318 is about 545.0624937455.

It can be divided in two parts, 1619 and 34318, that added together give a cube (35937 = 33³).

The spelling of 161934318 in words is "one hundred sixty-one million, nine hundred thirty-four thousand, three hundred eighteen".