161690112 has 60 divisors (see below), whose sum is σ = 466661910. Its totient is φ = 53895168.

The previous prime is 161690107. The next prime is 161690119. The reversal of 161690112 is 211096161.

It can be written as a sum of positive squares in only one way, i.e., 114575616 + 47114496 = 10704^2 + 6864^2 .

It is a super-2 number, since 2×161690112² = 52287384637145088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161690119) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12937 + ... + 22152.

Almost surely, 2^161690112 is an apocalyptic number.

161690112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161690112 is an abundant number, since it is smaller than the sum of its proper divisors (304971798).

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

161690112 is an equidigital number, since it uses as much as digits as its factorization.

161690112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35113 (or 35094 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 161690112 is about 12715.7426837759. The cubic root of 161690112 is about 544.7883609978.

The spelling of 161690112 in words is "one hundred sixty-one million, six hundred ninety thousand, one hundred twelve".