117802721 has 4 divisors (see below), whose sum is σ = 117829632. Its totient is φ = 117775812.

The previous prime is 117802687. The next prime is 117802781. The reversal of 117802721 is 127208711.

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: 127208711 = 7 ⋅18172673.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117802721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (117802781) 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, 5201 + ... + 16206.

It is an arithmetic number, because the mean of its divisors is an integer number (29457408).

Almost surely, 2^117802721 is an apocalyptic number.

It is an amenable number.

117802721 is a deficient number, since it is larger than the sum of its proper divisors (26911).

117802721 is an equidigital number, since it uses as much as digits as its factorization.

117802721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26910.

The product of its (nonzero) digits is 1568, while the sum is 29.

The square root of 117802721 is about 10853.6961906993. The cubic root of 117802721 is about 490.2133195857.

The spelling of 117802721 in words is "one hundred seventeen million, eight hundred two thousand, seven hundred twenty-one".