117724721 has 2 divisors, whose sum is σ = 117724722. Its totient is φ = 117724720.

The previous prime is 117724699. The next prime is 117724727. The reversal of 117724721 is 127427711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67881121 + 49843600 = 8239^2 + 7060^2 .

It is a cyclic number.

It is not a de Polignac number, because 117724721 - 2²⁶ = 50615857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (117724727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58862360 + 58862361.

It is an arithmetic number, because the mean of its divisors is an integer number (58862361).

Almost surely, 2^117724721 is an apocalyptic number.

It is an amenable number.

117724721 is a deficient number, since it is larger than the sum of its proper divisors (1).

117724721 is an equidigital number, since it uses as much as digits as its factorization.

117724721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5488, while the sum is 32.

The square root of 117724721 is about 10850.1023497477. The cubic root of 117724721 is about 490.1051017086.

The spelling of 117724721 in words is "one hundred seventeen million, seven hundred twenty-four thousand, seven hundred twenty-one".