117510721 has 4 divisors (see below), whose sum is σ = 117535444. Its totient is φ = 117486000.

The previous prime is 117510709. The next prime is 117510727. The reversal of 117510721 is 127015711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127015711 = 31 ⋅4097281.

It can be written as a sum of positive squares in 2 ways, for example, as 12673600 + 104837121 = 3560^2 + 10239^2 .

It is a cyclic number.

It is not a de Polignac number, because 117510721 - 2⁵ = 117510689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117510727) 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, 2730 + ... + 15571.

It is an arithmetic number, because the mean of its divisors is an integer number (29383861).

Almost surely, 2^117510721 is an apocalyptic number.

It is an amenable number.

117510721 is a deficient number, since it is larger than the sum of its proper divisors (24723).

117510721 is an equidigital number, since it uses as much as digits as its factorization.

117510721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24722.

The product of its (nonzero) digits is 490, while the sum is 25.

The square root of 117510721 is about 10840.2362059136. The cubic root of 117510721 is about 489.8079505610.

The spelling of 117510721 in words is "one hundred seventeen million, five hundred ten thousand, seven hundred twenty-one".