10561491 has 12 divisors (see below), whose sum is σ = 15292368. Its totient is φ = 7023984.

The previous prime is 10561487. The next prime is 10561513. The reversal of 10561491 is 19416501.

10561491 is a `hidden beast` number, since 10 + 561 + 4 + 91 = 666.

10561491 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 10561491 - 2² = 10561487 is a prime.

It is a super-2 number, since 2×10561491² = 223090184286162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10561451) 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, 3361 + ... + 5693.

It is an arithmetic number, because the mean of its divisors is an integer number (1274364).

Almost surely, 2^10561491 is an apocalyptic number.

10561491 is a deficient number, since it is larger than the sum of its proper divisors (4730877).

10561491 is a wasteful number, since it uses less digits than its factorization.

10561491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2842 (or 2839 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 10561491 is about 3249.8447655234. The cubic root of 10561491 is about 219.4025871752.

Adding to 10561491 its reverse (19416501), we get a palindrome (29977992).

The spelling of 10561491 in words is "ten million, five hundred sixty-one thousand, four hundred ninety-one".