197207311391 has 2 divisors, whose sum is σ = 197207311392. Its totient is φ = 197207311390.

The previous prime is 197207311361. The next prime is 197207311423. The reversal of 197207311391 is 193113702791.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197207311391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197207311331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98603655695 + 98603655696.

It is an arithmetic number, because the mean of its divisors is an integer number (98603655696).

Almost surely, 2^197207311391 is an apocalyptic number.

197207311391 is a deficient number, since it is larger than the sum of its proper divisors (1).

197207311391 is an equidigital number, since it uses as much as digits as its factorization.

197207311391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71442, while the sum is 44.

The spelling of 197207311391 in words is "one hundred ninety-seven billion, two hundred seven million, three hundred eleven thousand, three hundred ninety-one".