161561030 has 32 divisors (see below), whose sum is σ = 318543840. Its totient is φ = 58723840.

The previous prime is 161561027. The next prime is 161561051. The reversal of 161561030 is 30165161.

It is a happy number.

It is a super-2 number, since 2×161561030² = 52203932829321800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161560987 and 161561005.

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 15 ways as a sum of consecutive naturals, for example, 11456 + ... + 21315.

It is an arithmetic number, because the mean of its divisors is an integer number (9954495).

Almost surely, 2^161561030 is an apocalyptic number.

161561030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161561030 is a deficient number, since it is larger than the sum of its proper divisors (156982810).

161561030 is a wasteful number, since it uses less digits than its factorization.

161561030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32824.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 161561030 is about 12710.6659935662. The cubic root of 161561030 is about 544.6433488464.

The spelling of 161561030 in words is "one hundred sixty-one million, five hundred sixty-one thousand, thirty".