199505231 has 2 divisors, whose sum is σ = 199505232. Its totient is φ = 199505230.

The previous prime is 199505227. The next prime is 199505233. The reversal of 199505231 is 132505991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199505231 - 2² = 199505227 is a prime.

It is a super-2 number, since 2×199505231² = 79604674392726722, which contains 22 as substring.

Together with 199505233, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 199505191 and 199505200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199505233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99752615 + 99752616.

It is an arithmetic number, because the mean of its divisors is an integer number (99752616).

Almost surely, 2^199505231 is an apocalyptic number.

199505231 is a deficient number, since it is larger than the sum of its proper divisors (1).

199505231 is an equidigital number, since it uses as much as digits as its factorization.

199505231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 199505231 is about 14124.6320660044. The cubic root of 199505231 is about 584.3209116572.

The spelling of 199505231 in words is "one hundred ninety-nine million, five hundred five thousand, two hundred thirty-one".