190681 has 4 divisors (see below), whose sum is σ = 196864. Its totient is φ = 184500.

The previous prime is 190669. The next prime is 190699. The reversal of 190681 is 186091.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 186091 = 71 ⋅2621.

It is a cyclic number.

It is not a de Polignac number, because 190681 - 2⁵ = 190649 is a prime.

It is a super-2 number, since 2×190681² = 72718487522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3045 + ... + 3106.

It is an arithmetic number, because the mean of its divisors is an integer number (49216).

2¹⁹⁰⁶⁸¹ is an apocalyptic number.

It is an amenable number.

190681 is a deficient number, since it is larger than the sum of its proper divisors (6183).

190681 is an equidigital number, since it uses as much as digits as its factorization.

190681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6182.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 190681 is about 436.6703562185. The cubic root of 190681 is about 57.5575730843.

The spelling of 190681 in words is "one hundred ninety thousand, six hundred eighty-one".