104564721 has 4 divisors (see below), whose sum is σ = 139419632. Its totient is φ = 69709812.

The previous prime is 104564717. The next prime is 104564723. The reversal of 104564721 is 127465401.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 104564721 - 2² = 104564717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (104564723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17427451 + ... + 17427456.

It is an arithmetic number, because the mean of its divisors is an integer number (34854908).

Almost surely, 2^104564721 is an apocalyptic number.

It is an amenable number.

104564721 is a deficient number, since it is larger than the sum of its proper divisors (34854911).

104564721 is an equidigital number, since it uses as much as digits as its factorization.

104564721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34854910.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 104564721 is about 10225.6892677218. The cubic root of 104564721 is about 471.1165861923.

It can be divided in two parts, 10 and 4564721, that added together give a triangular number (4564731 = T₃₀₂₁).

The spelling of 104564721 in words is "one hundred four million, five hundred sixty-four thousand, seven hundred twenty-one".