104571561 has 4 divisors (see below), whose sum is σ = 139428752. Its totient is φ = 69714372.

The previous prime is 104571557. The next prime is 104571563. The reversal of 104571561 is 165175401.

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 104571561 - 2² = 104571557 is a prime.

It is a super-2 number, since 2×104571561² = 21870422739953442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (104571563) 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, 17428591 + ... + 17428596.

It is an arithmetic number, because the mean of its divisors is an integer number (34857188).

Almost surely, 2^104571561 is an apocalyptic number.

It is an amenable number.

104571561 is a deficient number, since it is larger than the sum of its proper divisors (34857191).

104571561 is an equidigital number, since it uses as much as digits as its factorization.

104571561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34857190.

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 104571561 is about 10226.0237140347. The cubic root of 104571561 is about 471.1268585134.

The spelling of 104571561 in words is "one hundred four million, five hundred seventy-one thousand, five hundred sixty-one".