1391661350197 has 2 divisors, whose sum is σ = 1391661350198. Its totient is φ = 1391661350196.

The previous prime is 1391661350143. The next prime is 1391661350231. The reversal of 1391661350197 is 7910531661931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1356260551396 + 35400798801 = 1164586^2 + 188151^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391661350197 - 2¹¹ = 1391661348149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1391661350297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695830675098 + 695830675099.

It is an arithmetic number, because the mean of its divisors is an integer number (695830675099).

Almost surely, 2^{1391661350197} is an apocalyptic number.

It is an amenable number.

1391661350197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391661350197 is an equidigital number, since it uses as much as digits as its factorization.

1391661350197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 918540, while the sum is 52.

The spelling of 1391661350197 in words is "one trillion, three hundred ninety-one billion, six hundred sixty-one million, three hundred fifty thousand, one hundred ninety-seven".