199131 has 4 divisors (see below), whose sum is σ = 265512. Its totient is φ = 132752.

The previous prime is 199109. The next prime is 199151. The reversal of 199131 is 131991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131991 = 3 ⋅43997.

It is a cyclic number.

It is not a de Polignac number, because 199131 - 2¹¹ = 197083 is a prime.

It is a super-2 number, since 2×199131² = 79306310322, which contains 22 as substring.

It is a D-number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (199151) 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, 33186 + ... + 33191.

It is an arithmetic number, because the mean of its divisors is an integer number (66378).

2¹⁹⁹¹³¹ is an apocalyptic number.

199131 is a deficient number, since it is larger than the sum of its proper divisors (66381).

199131 is an equidigital number, since it uses as much as digits as its factorization.

199131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66380.

The product of its digits is 243, while the sum is 24.

The square root of 199131 is about 446.2409662951. The cubic root of 199131 is about 58.3955327477.

The spelling of 199131 in words is "one hundred ninety-nine thousand, one hundred thirty-one".