104688721 has 2 divisors, whose sum is σ = 104688722. Its totient is φ = 104688720.

The previous prime is 104688691. The next prime is 104688733. The reversal of 104688721 is 127886401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81993025 + 22695696 = 9055^2 + 4764^2 .

It is an emirp because it is prime and its reverse (127886401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 104688721 - 2⁷ = 104688593 is a prime.

It is not a weakly prime, because it can be changed into another prime (104688751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52344360 + 52344361.

It is an arithmetic number, because the mean of its divisors is an integer number (52344361).

Almost surely, 2^104688721 is an apocalyptic number.

It is an amenable number.

104688721 is a deficient number, since it is larger than the sum of its proper divisors (1).

104688721 is an equidigital number, since it uses as much as digits as its factorization.

104688721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 104688721 is about 10231.7506322232. The cubic root of 104688721 is about 471.3027400535.

The spelling of 104688721 in words is "one hundred four million, six hundred eighty-eight thousand, seven hundred twenty-one".