11773561 has 2 divisors, whose sum is σ = 11773562. Its totient is φ = 11773560.

The previous prime is 11773501. The next prime is 11773603. The reversal of 11773561 is 16537711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8732025 + 3041536 = 2955^2 + 1744^2 .

It is an emirp because it is prime and its reverse (16537711) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11773561 is a prime.

It is not a weakly prime, because it can be changed into another prime (11773501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5886780 + 5886781.

It is an arithmetic number, because the mean of its divisors is an integer number (5886781).

Almost surely, 2^11773561 is an apocalyptic number.

It is an amenable number.

11773561 is a deficient number, since it is larger than the sum of its proper divisors (1).

11773561 is an equidigital number, since it uses as much as digits as its factorization.

11773561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4410, while the sum is 31.

The square root of 11773561 is about 3431.2623041674. The cubic root of 11773561 is about 227.4936503481.

The spelling of 11773561 in words is "eleven million, seven hundred seventy-three thousand, five hundred sixty-one".