161381830 has 16 divisors (see below), whose sum is σ = 294467904. Its totient is φ = 63668160.

The previous prime is 161381813. The next prime is 161381849. The reversal of 161381830 is 38183161.

It is a junction number, because it is equal to n+sod(n) for n = 161381792 and 161381801.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109806 + ... + 111265.

It is an arithmetic number, because the mean of its divisors is an integer number (18404244).

Almost surely, 2^161381830 is an apocalyptic number.

161381830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161381830 is a deficient number, since it is larger than the sum of its proper divisors (133086074).

161381830 is a wasteful number, since it uses less digits than its factorization.

161381830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221151.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 161381830 is about 12703.6148398792. The cubic root of 161381830 is about 544.4419054751.

The spelling of 161381830 in words is "one hundred sixty-one million, three hundred eighty-one thousand, eight hundred thirty".