117191729 has 4 divisors (see below), whose sum is σ = 118508580. Its totient is φ = 115874880.

The previous prime is 117191719. The next prime is 117191731. The reversal of 117191729 is 927191711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 927191711 = 881 ⋅1052431.

It can be written as a sum of positive squares in 2 ways, for example, as 71656225 + 45535504 = 8465^2 + 6748^2 .

It is a cyclic number.

It is not a de Polignac number, because 117191729 - 2⁴ = 117191713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 117191692 and 117191701.

It is not an unprimeable number, because it can be changed into a prime (117191719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 658292 + ... + 658469.

It is an arithmetic number, because the mean of its divisors is an integer number (29627145).

Almost surely, 2^117191729 is an apocalyptic number.

It is an amenable number.

117191729 is a deficient number, since it is larger than the sum of its proper divisors (1316851).

117191729 is an equidigital number, since it uses as much as digits as its factorization.

117191729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316850.

The product of its digits is 7938, while the sum is 38.

The square root of 117191729 is about 10825.5128746864. The cubic root of 117191729 is about 489.3643416443.

The spelling of 117191729 in words is "one hundred seventeen million, one hundred ninety-one thousand, seven hundred twenty-nine".