161290120 has 32 divisors (see below), whose sum is σ = 363525120. Its totient is φ = 64405440.

The previous prime is 161290093. The next prime is 161290121. The reversal of 161290120 is 21092161.

It is a super-2 number, since 2×161290120² = 52029005619228800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161290091 and 161290100.

It is not an unprimeable number, because it can be changed into a prime (161290121) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 22585 + ... + 28855.

It is an arithmetic number, because the mean of its divisors is an integer number (11360160).

Almost surely, 2^161290120 is an apocalyptic number.

161290120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161290120 is an abundant number, since it is smaller than the sum of its proper divisors (202235000).

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

161290120 is a wasteful number, since it uses less digits than its factorization.

161290120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6925 (or 6921 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 161290120 is about 12700.0047244086. The cubic root of 161290120 is about 544.3387541923.

The spelling of 161290120 in words is "one hundred sixty-one million, two hundred ninety thousand, one hundred twenty".