199631 has 4 divisors (see below), whose sum is σ = 211392. Its totient is φ = 187872.

The previous prime is 199621. The next prime is 199637. The reversal of 199631 is 136991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 199631 - 2⁶ = 199567 is a prime.

It is a super-2 number, since 2×199631² = 79705072322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199594 and 199603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199637) 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 3 ways as a sum of consecutive naturals, for example, 5855 + ... + 5888.

It is an arithmetic number, because the mean of its divisors is an integer number (52848).

2¹⁹⁹⁶³¹ is an apocalyptic number.

199631 is a deficient number, since it is larger than the sum of its proper divisors (11761).

199631 is a wasteful number, since it uses less digits than its factorization.

199631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11760.

The product of its digits is 1458, while the sum is 29.

The square root of 199631 is about 446.8008504916. The cubic root of 199631 is about 58.4443672046. Note that the first 3 decimals are identical.

The spelling of 199631 in words is "one hundred ninety-nine thousand, six hundred thirty-one".