117130721 has 4 divisors (see below), whose sum is σ = 119622912. Its totient is φ = 114638532.

The previous prime is 117130709. The next prime is 117130729. The reversal of 117130721 is 127031711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127031711 = 9137 ⋅13903.

It is a cyclic number.

It is not a de Polignac number, because 117130721 - 2¹⁰ = 117129697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117130729) 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, 1246025 + ... + 1246118.

It is an arithmetic number, because the mean of its divisors is an integer number (29905728).

Almost surely, 2^117130721 is an apocalyptic number.

It is an amenable number.

117130721 is a deficient number, since it is larger than the sum of its proper divisors (2492191).

117130721 is an equidigital number, since it uses as much as digits as its factorization.

117130721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2492190.

The product of its (nonzero) digits is 294, while the sum is 23.

The square root of 117130721 is about 10822.6947198930. The cubic root of 117130721 is about 489.2794086824.

The spelling of 117130721 in words is "one hundred seventeen million, one hundred thirty thousand, seven hundred twenty-one".