108471721 has 2 divisors, whose sum is σ = 108471722. Its totient is φ = 108471720.

The previous prime is 108471707. The next prime is 108471739. The reversal of 108471721 is 127174801.

108471721 = 7364² + 7365².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54243225 + 54228496 = 7365^2 + 7364^2 .

It is a cyclic number.

It is not a de Polignac number, because 108471721 - 2²⁵ = 74917289 is a prime.

It is a super-2 number, since 2×108471721² = 23532228513403682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (108471791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54235860 + 54235861.

It is an arithmetic number, because the mean of its divisors is an integer number (54235861).

Almost surely, 2^108471721 is an apocalyptic number.

108471721 is the 7365-th centered square number.

It is an amenable number.

108471721 is a deficient number, since it is larger than the sum of its proper divisors (1).

108471721 is an equidigital number, since it uses as much as digits as its factorization.

108471721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3136, while the sum is 31.

The square root of 108471721 is about 10414.9758041006. The cubic root of 108471721 is about 476.9126515484.

The spelling of 108471721 in words is "one hundred eight million, four hundred seventy-one thousand, seven hundred twenty-one".