117900721 has 2 divisors, whose sum is σ = 117900722. Its totient is φ = 117900720.

The previous prime is 117900659. The next prime is 117900743. The reversal of 117900721 is 127009711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117831025 + 69696 = 10855^2 + 264^2 .

It is an emirp because it is prime and its reverse (127009711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 117900721 - 2¹³ = 117892529 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 117900721.

It is not a weakly prime, because it can be changed into another prime (117900751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58950360 + 58950361.

It is an arithmetic number, because the mean of its divisors is an integer number (58950361).

Almost surely, 2^117900721 is an apocalyptic number.

It is an amenable number.

117900721 is a deficient number, since it is larger than the sum of its proper divisors (1).

117900721 is an equidigital number, since it uses as much as digits as its factorization.

117900721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 882, while the sum is 28.

The square root of 117900721 is about 10858.2098432476. The cubic root of 117900721 is about 490.3492179456.

The spelling of 117900721 in words is "one hundred seventeen million, nine hundred thousand, seven hundred twenty-one".