117247391 has 2 divisors, whose sum is σ = 117247392. Its totient is φ = 117247390.

The previous prime is 117247373. The next prime is 117247393. The reversal of 117247391 is 193742711.

It is a strong prime.

It is an emirp because it is prime and its reverse (193742711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 117247391 - 2²⁶ = 50138527 is a prime.

Together with 117247393, 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 (117247393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58623695 + 58623696.

It is an arithmetic number, because the mean of its divisors is an integer number (58623696).

Almost surely, 2^117247391 is an apocalyptic number.

117247391 is a deficient number, since it is larger than the sum of its proper divisors (1).

117247391 is an equidigital number, since it uses as much as digits as its factorization.

117247391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 35.

The square root of 117247391 is about 10828.0834407572. The cubic root of 117247391 is about 489.4418064018.

The spelling of 117247391 in words is "one hundred seventeen million, two hundred forty-seven thousand, three hundred ninety-one".