161819224 has 32 divisors (see below), whose sum is σ = 351648000. Its totient is φ = 68372640.

The previous prime is 161819197. The next prime is 161819227. The reversal of 161819224 is 422918161.

It is a happy number.

It is a super-2 number, since 2×161819224² = 52370922511924352, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161819224.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161819227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16374 + ... + 24325.

It is an arithmetic number, because the mean of its divisors is an integer number (10989000).

Almost surely, 2^161819224 is an apocalyptic number.

161819224 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

161819224 is an abundant number, since it is smaller than the sum of its proper divisors (189828776).

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

161819224 is a wasteful number, since it uses less digits than its factorization.

161819224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40783 (or 40779 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The square root of 161819224 is about 12720.8185271232. The cubic root of 161819224 is about 544.9333296668.

The spelling of 161819224 in words is "one hundred sixty-one million, eight hundred nineteen thousand, two hundred twenty-four".