1197910391 has 2 divisors, whose sum is σ = 1197910392. Its totient is φ = 1197910390.

The previous prime is 1197910267. The next prime is 1197910393. The reversal of 1197910391 is 1930197911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1197910391 - 2¹⁸ = 1197648247 is a prime.

Together with 1197910393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1197910393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 598955195 + 598955196.

It is an arithmetic number, because the mean of its divisors is an integer number (598955196).

Almost surely, 2^1197910391 is an apocalyptic number.

1197910391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1197910391 is an equidigital number, since it uses as much as digits as its factorization.

1197910391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15309, while the sum is 41.

The square root of 1197910391 is about 34610.8421018617. The cubic root of 1197910391 is about 1062.0413938869.

The spelling of 1197910391 in words is "one billion, one hundred ninety-seven million, nine hundred ten thousand, three hundred ninety-one".