117217291 has 4 divisors (see below), whose sum is σ = 119428992. Its totient is φ = 115005592.

The previous prime is 117217283. The next prime is 117217343. The reversal of 117217291 is 192712711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192712711 = 9391 ⋅20521.

It is a cyclic number.

It is not a de Polignac number, because 117217291 - 2³ = 117217283 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117217211) 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, 1105771 + ... + 1105876.

It is an arithmetic number, because the mean of its divisors is an integer number (29857248).

Almost surely, 2^117217291 is an apocalyptic number.

117217291 is a deficient number, since it is larger than the sum of its proper divisors (2211701).

117217291 is an equidigital number, since it uses as much as digits as its factorization.

117217291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211700.

The product of its digits is 1764, while the sum is 31.

The square root of 117217291 is about 10826.6934472165. The cubic root of 117217291 is about 489.3999193027.

The spelling of 117217291 in words is "one hundred seventeen million, two hundred seventeen thousand, two hundred ninety-one".