103788721 has 2 divisors, whose sum is σ = 103788722. Its totient is φ = 103788720.

The previous prime is 103788683. The next prime is 103788731. The reversal of 103788721 is 127887301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87628321 + 16160400 = 9361^2 + 4020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-103788721 is a prime.

It is not a weakly prime, because it can be changed into another prime (103788731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51894360 + 51894361.

It is an arithmetic number, because the mean of its divisors is an integer number (51894361).

Almost surely, 2^103788721 is an apocalyptic number.

It is an amenable number.

103788721 is a deficient number, since it is larger than the sum of its proper divisors (1).

103788721 is an equidigital number, since it uses as much as digits as its factorization.

103788721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 37.

The square root of 103788721 is about 10187.6749555529. The cubic root of 103788721 is about 469.9482680349.

The spelling of 103788721 in words is "one hundred three million, seven hundred eighty-eight thousand, seven hundred twenty-one".