161919030 has 192 divisors, whose sum is σ = 502165440. Its totient is φ = 33094656.

The previous prime is 161919001. The next prime is 161919047. The reversal of 161919030 is 30919161.

It is a super-2 number, since 2×161919030² = 52435544552281800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 706956 + ... + 707184.

It is an arithmetic number, because the mean of its divisors is an integer number (2615445).

Almost surely, 2^161919030 is an apocalyptic number.

161919030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161919030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251082720).

161919030 is an abundant number, since it is smaller than the sum of its proper divisors (340246410).

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

161919030 is a wasteful number, since it uses less digits than its factorization.

161919030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 161919030 is about 12724.7408618015. The cubic root of 161919030 is about 545.0453403347.

The spelling of 161919030 in words is "one hundred sixty-one million, nine hundred nineteen thousand, thirty".