197424311891 has 2 divisors, whose sum is σ = 197424311892. Its totient is φ = 197424311890.

The previous prime is 197424311873. The next prime is 197424311893. The reversal of 197424311891 is 198113424791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197424311891 - 2¹⁴ = 197424295507 is a prime.

Together with 197424311893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197424311893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98712155945 + 98712155946.

It is an arithmetic number, because the mean of its divisors is an integer number (98712155946).

Almost surely, 2^197424311891 is an apocalyptic number.

197424311891 is a deficient number, since it is larger than the sum of its proper divisors (1).

197424311891 is an equidigital number, since it uses as much as digits as its factorization.

197424311891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 50.

The spelling of 197424311891 in words is "one hundred ninety-seven billion, four hundred twenty-four million, three hundred eleven thousand, eight hundred ninety-one".