195731 has 2 divisors, whose sum is σ = 195732. Its totient is φ = 195730.

The previous prime is 195709. The next prime is 195733. The reversal of 195731 is 137591.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 195731 - 2¹⁰ = 194707 is a prime.

It is a super-2 number, since 2×195731² = 76621248722, which contains 22 as substring.

Together with 195733, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195731.

It is not a weakly prime, because it can be changed into another prime (195733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97865 + 97866.

It is an arithmetic number, because the mean of its divisors is an integer number (97866).

2¹⁹⁵⁷³¹ is an apocalyptic number.

195731 is a deficient number, since it is larger than the sum of its proper divisors (1).

195731 is an equidigital number, since it uses as much as digits as its factorization.

195731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 945, while the sum is 26.

The square root of 195731 is about 442.4149635806. The cubic root of 195731 is about 58.0612709623.

The spelling of 195731 in words is "one hundred ninety-five thousand, seven hundred thirty-one".