117490721 has 4 divisors (see below), whose sum is σ = 117554052. Its totient is φ = 117427392.

The previous prime is 117490717. The next prime is 117490753. The reversal of 117490721 is 127094711.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 72063121 + 45427600 = 8489^2 + 6740^2 .

It is a cyclic number.

It is not a de Polignac number, because 117490721 - 2² = 117490717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117490421) 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, 28796 + ... + 32621.

It is an arithmetic number, because the mean of its divisors is an integer number (29388513).

Almost surely, 2^117490721 is an apocalyptic number.

It is an amenable number.

117490721 is a deficient number, since it is larger than the sum of its proper divisors (63331).

117490721 is an equidigital number, since it uses as much as digits as its factorization.

117490721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63330.

The product of its (nonzero) digits is 3528, while the sum is 32.

The square root of 117490721 is about 10839.3136775351. The cubic root of 117490721 is about 489.7801609978.

The spelling of 117490721 in words is "one hundred seventeen million, four hundred ninety thousand, seven hundred twenty-one".