1171387391 has 2 divisors, whose sum is σ = 1171387392. Its totient is φ = 1171387390.

The previous prime is 1171387387. The next prime is 1171387417. The reversal of 1171387391 is 1937831711.

It is a weak prime.

It is an emirp because it is prime and its reverse (1937831711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1171387391 - 2² = 1171387387 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1171387351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585693695 + 585693696.

It is an arithmetic number, because the mean of its divisors is an integer number (585693696).

Almost surely, 2^1171387391 is an apocalyptic number.

1171387391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1171387391 is an equidigital number, since it uses as much as digits as its factorization.

1171387391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 41.

The square root of 1171387391 is about 34225.5371177722. The cubic root of 1171387391 is about 1054.1445836580.

The spelling of 1171387391 in words is "one billion, one hundred seventy-one million, three hundred eighty-seven thousand, three hundred ninety-one".