103721389 has 2 divisors, whose sum is σ = 103721390. Its totient is φ = 103721388.

The previous prime is 103721357. The next prime is 103721417. The reversal of 103721389 is 983127301.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62015625 + 41705764 = 7875^2 + 6458^2 .

It is a cyclic number.

It is not a de Polignac number, because 103721389 - 2⁵ = 103721357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103721089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51860694 + 51860695.

It is an arithmetic number, because the mean of its divisors is an integer number (51860695).

Almost surely, 2^103721389 is an apocalyptic number.

It is an amenable number.

103721389 is a deficient number, since it is larger than the sum of its proper divisors (1).

103721389 is an equidigital number, since it uses as much as digits as its factorization.

103721389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 103721389 is about 10184.3698381392. The cubic root of 103721389 is about 469.8466211457.

The spelling of 103721389 in words is "one hundred three million, seven hundred twenty-one thousand, three hundred eighty-nine".