10611561 has 4 divisors (see below), whose sum is σ = 14148752. Its totient is φ = 7074372.

The previous prime is 10611551. The next prime is 10611571. The reversal of 10611561 is 16511601.

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: 16511601 = 3 ⋅5503867.

It is an interprime number because it is at equal distance from previous prime (10611551) and next prime (10611571).

It is not a de Polignac number, because 10611561 - 2¹⁵ = 10578793 is a prime.

It is a super-2 number, since 2×10611561² = 225210453713442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10611521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1768591 + ... + 1768596.

It is an arithmetic number, because the mean of its divisors is an integer number (3537188).

Almost surely, 2^10611561 is an apocalyptic number.

It is an amenable number.

10611561 is a deficient number, since it is larger than the sum of its proper divisors (3537191).

10611561 is an equidigital number, since it uses as much as digits as its factorization.

10611561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3537190.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 10611561 is about 3257.5391018375. The cubic root of 10611561 is about 219.7487558835.

The spelling of 10611561 in words is "ten million, six hundred eleven thousand, five hundred sixty-one".