117471721 has 6 divisors (see below), whose sum is σ = 121663022. Its totient is φ = 113420160.

The previous prime is 117471719. The next prime is 117471763. The reversal of 117471721 is 127174711.

It can be written as a sum of positive squares in 3 ways, for example, as 4347225 + 113124496 = 2085^2 + 10636^2 .

It is not a de Polignac number, because 117471721 - 2¹ = 117471719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117472721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69000 + ... + 70681.

Almost surely, 2^117471721 is an apocalyptic number.

It is an amenable number.

117471721 is a deficient number, since it is larger than the sum of its proper divisors (4191301).

117471721 is an equidigital number, since it uses as much as digits as its factorization.

117471721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139739 (or 139710 counting only the distinct ones).

The product of its digits is 2744, while the sum is 31.

The square root of 117471721 is about 10838.4372028443. The cubic root of 117471721 is about 489.7537579915.

The spelling of 117471721 in words is "one hundred seventeen million, four hundred seventy-one thousand, seven hundred twenty-one".