190861 has 4 divisors (see below), whose sum is σ = 208224. Its totient is φ = 173500.

The previous prime is 190843. The next prime is 190871. The reversal of 190861 is 168091.

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.

It is a cyclic number.

It is not a de Polignac number, because 190861 - 2⁵ = 190829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190811) 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, 8665 + ... + 8686.

It is an arithmetic number, because the mean of its divisors is an integer number (52056).

2¹⁹⁰⁸⁶¹ is an apocalyptic number.

190861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

190861 is a deficient number, since it is larger than the sum of its proper divisors (17363).

190861 is a wasteful number, since it uses less digits than its factorization.

190861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17362.

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

The square root of 190861 is about 436.8764127302. The cubic root of 190861 is about 57.5756785499.

The spelling of 190861 in words is "one hundred ninety thousand, eight hundred sixty-one".