117891749 has 2 divisors, whose sum is σ = 117891750. Its totient is φ = 117891748.

The previous prime is 117891691. The next prime is 117891797. The reversal of 117891749 is 947198711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77123524 + 40768225 = 8782^2 + 6385^2 .

It is a cyclic number.

It is not a de Polignac number, because 117891749 - 2⁸ = 117891493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117891049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58945874 + 58945875.

It is an arithmetic number, because the mean of its divisors is an integer number (58945875).

Almost surely, 2^117891749 is an apocalyptic number.

It is an amenable number.

117891749 is a deficient number, since it is larger than the sum of its proper divisors (1).

117891749 is an equidigital number, since it uses as much as digits as its factorization.

117891749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 47.

The square root of 117891749 is about 10857.7966917787. The cubic root of 117891749 is about 490.3367794444.

The spelling of 117891749 in words is "one hundred seventeen million, eight hundred ninety-one thousand, seven hundred forty-nine".