103617721 has 2 divisors, whose sum is σ = 103617722. Its totient is φ = 103617720.

The previous prime is 103617677. The next prime is 103617739. The reversal of 103617721 is 127716301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79852096 + 23765625 = 8936^2 + 4875^2 .

It is an emirp because it is prime and its reverse (127716301) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 103617721 - 2¹³ = 103609529 is a prime.

It is a super-3 number, since 3×103617721³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 103617721.

It is not a weakly prime, because it can be changed into another prime (103617791) 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 as a sum of consecutive naturals, namely, 51808860 + 51808861.

It is an arithmetic number, because the mean of its divisors is an integer number (51808861).

Almost surely, 2^103617721 is an apocalyptic number.

It is an amenable number.

103617721 is a deficient number, since it is larger than the sum of its proper divisors (1).

103617721 is an equidigital number, since it uses as much as digits as its factorization.

103617721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 103617721 is about 10179.2790019726. The cubic root of 103617721 is about 469.6900340403.

The spelling of 103617721 in words is "one hundred three million, six hundred seventeen thousand, seven hundred twenty-one".