195867491 has 2 divisors, whose sum is σ = 195867492. Its totient is φ = 195867490.

The previous prime is 195867481. The next prime is 195867509. The reversal of 195867491 is 194768591.

It is a weak prime.

It is an emirp because it is prime and its reverse (194768591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 195867491 - 2¹⁰ = 195866467 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (195867461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97933745 + 97933746.

It is an arithmetic number, because the mean of its divisors is an integer number (97933746).

Almost surely, 2^195867491 is an apocalyptic number.

195867491 is a deficient number, since it is larger than the sum of its proper divisors (1).

195867491 is an equidigital number, since it uses as much as digits as its factorization.

195867491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 50.

The square root of 195867491 is about 13995.2667355789. The cubic root of 195867491 is about 580.7476396976.

The spelling of 195867491 in words is "one hundred ninety-five million, eight hundred sixty-seven thousand, four hundred ninety-one".