161749224 has 240 divisors, whose sum is σ = 563317920. Its totient is φ = 42456960.

The previous prime is 161749219. The next prime is 161749249. The reversal of 161749224 is 422947161.

It is a happy number.

161749224 is a `hidden beast` number, since 161 + 7 + 492 + 2 + 4 = 666.

It is a super-2 number, since 2×161749224² = 52325622929204352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 766479 + ... + 766689.

It is an arithmetic number, because the mean of its divisors is an integer number (2347158).

Almost surely, 2^161749224 is an apocalyptic number.

161749224 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161749224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281658960).

161749224 is an abundant number, since it is smaller than the sum of its proper divisors (401568696).

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

161749224 is a wasteful number, since it uses less digits than its factorization.

161749224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 236 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 161749224 is about 12718.0668342323. The cubic root of 161749224 is about 544.8547423111.

The spelling of 161749224 in words is "one hundred sixty-one million, seven hundred forty-nine thousand, two hundred twenty-four".