104780521 has 4 divisors (see below), whose sum is σ = 104802192. Its totient is φ = 104758852.

The previous prime is 104780491. The next prime is 104780579. The reversal of 104780521 is 125087401.

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, and also an emirpimes, since its reverse is a distinct semiprime: 125087401 = 887 ⋅141023.

It is a cyclic number.

It is not a de Polignac number, because 104780521 - 2⁹ = 104780009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 104780521.

It is not an unprimeable number, because it can be changed into a prime (104780581) 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, 90 + ... + 14476.

It is an arithmetic number, because the mean of its divisors is an integer number (26200548).

Almost surely, 2^104780521 is an apocalyptic number.

It is an amenable number.

104780521 is a deficient number, since it is larger than the sum of its proper divisors (21671).

104780521 is an equidigital number, since it uses as much as digits as its factorization.

104780521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21670.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 104780521 is about 10236.2356850553. The cubic root of 104780521 is about 471.4404592874.

It can be divided in two parts, 104 and 780521, that added together give a triangular number (780625 = T₁₂₄₉).

The spelling of 104780521 in words is "one hundred four million, seven hundred eighty thousand, five hundred twenty-one".