11147561 has 2 divisors, whose sum is σ = 11147562. Its totient is φ = 11147560.

The previous prime is 11147537. The next prime is 11147579. The reversal of 11147561 is 16574111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8526400 + 2621161 = 2920^2 + 1619^2 .

It is an emirp because it is prime and its reverse (16574111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11147561 - 2¹⁰ = 11146537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11147561.

It is not a weakly prime, because it can be changed into another prime (11147501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5573780 + 5573781.

It is an arithmetic number, because the mean of its divisors is an integer number (5573781).

Almost surely, 2^11147561 is an apocalyptic number.

It is an amenable number.

11147561 is a deficient number, since it is larger than the sum of its proper divisors (1).

11147561 is an equidigital number, since it uses as much as digits as its factorization.

11147561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 26.

The square root of 11147561 is about 3338.7963400004. The cubic root of 11147561 is about 223.3880579243.

The spelling of 11147561 in words is "eleven million, one hundred forty-seven thousand, five hundred sixty-one".