117855791 has 2 divisors, whose sum is σ = 117855792. Its totient is φ = 117855790.

The previous prime is 117855709. The next prime is 117855809. The reversal of 117855791 is 197558711.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 117855791 - 2¹⁸ = 117593647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117855701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58927895 + 58927896.

It is an arithmetic number, because the mean of its divisors is an integer number (58927896).

Almost surely, 2^117855791 is an apocalyptic number.

117855791 is a deficient number, since it is larger than the sum of its proper divisors (1).

117855791 is an equidigital number, since it uses as much as digits as its factorization.

117855791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88200, while the sum is 44.

The square root of 117855791 is about 10856.1407046888. The cubic root of 117855791 is about 490.2869220598.

It can be divided in two parts, 11785 and 5791, that added together give a cube (17576 = 26³).

The spelling of 117855791 in words is "one hundred seventeen million, eight hundred fifty-five thousand, seven hundred ninety-one".