190871681 has 32 divisors (see below), whose sum is σ = 264585216. Its totient is φ = 132840000.

The previous prime is 190871647. The next prime is 190871731. The reversal of 190871681 is 186178091.

It is a cyclic number.

It is not a de Polignac number, because 190871681 - 2⁶ = 190871617 is a prime.

It is a super-2 number, since 2×190871681² = 72863997215531522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (190871381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27956 + ... + 34106.

It is an arithmetic number, because the mean of its divisors is an integer number (8268288).

Almost surely, 2^190871681 is an apocalyptic number.

190871681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

190871681 is a deficient number, since it is larger than the sum of its proper divisors (73713535).

190871681 is a wasteful number, since it uses less digits than its factorization.

190871681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6213.

The product of its (nonzero) digits is 24192, while the sum is 41.

The square root of 190871681 is about 13815.6317626086. The cubic root of 190871681 is about 575.7675255030.

The spelling of 190871681 in words is "one hundred ninety million, eight hundred seventy-one thousand, six hundred eighty-one".