195724391 has 2 divisors, whose sum is σ = 195724392. Its totient is φ = 195724390.

The previous prime is 195724387. The next prime is 195724409. The reversal of 195724391 is 193427591.

195724391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 195724391 - 2² = 195724387 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195724381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97862195 + 97862196.

It is an arithmetic number, because the mean of its divisors is an integer number (97862196).

Almost surely, 2^195724391 is an apocalyptic number.

195724391 is a deficient number, since it is larger than the sum of its proper divisors (1).

195724391 is an equidigital number, since it uses as much as digits as its factorization.

195724391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 41.

The square root of 195724391 is about 13990.1533587020. The cubic root of 195724391 is about 580.6061746119.

The spelling of 195724391 in words is "one hundred ninety-five million, seven hundred twenty-four thousand, three hundred ninety-one".