10561581 has 12 divisors (see below), whose sum is σ = 15349152. Its totient is φ = 6997896.

The previous prime is 10561571. The next prime is 10561583. The reversal of 10561581 is 18516501.

It is a de Polignac number, because none of the positive numbers 2^k-10561581 is a prime.

It is a super-2 number, since 2×10561581² = 223093986439122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10561583) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2011 + ... + 5016.

It is an arithmetic number, because the mean of its divisors is an integer number (1279096).

Almost surely, 2^10561581 is an apocalyptic number.

It is an amenable number.

10561581 is a deficient number, since it is larger than the sum of its proper divisors (4787571).

10561581 is a wasteful number, since it uses less digits than its factorization.

10561581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7200 (or 7197 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The square root of 10561581 is about 3249.8586123092. The cubic root of 10561581 is about 219.4032103883.

The spelling of 10561581 in words is "ten million, five hundred sixty-one thousand, five hundred eighty-one".