10505561 has 4 divisors (see below), whose sum is σ = 11460624. Its totient is φ = 9550500.

The previous prime is 10505531. The next prime is 10505563. The reversal of 10505561 is 16550501.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10505561 is a prime.

It is a super-2 number, since 2×10505561² = 220733623849442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10505563) 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, 477515 + ... + 477536.

It is an arithmetic number, because the mean of its divisors is an integer number (2865156).

Almost surely, 2^10505561 is an apocalyptic number.

10505561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10505561 is a deficient number, since it is larger than the sum of its proper divisors (955063).

10505561 is an equidigital number, since it uses as much as digits as its factorization.

10505561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 955062.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 10505561 is about 3241.2283165491. The cubic root of 10505561 is about 219.0146081177.

The spelling of 10505561 in words is "ten million, five hundred five thousand, five hundred sixty-one".