11745561 has 4 divisors (see below), whose sum is σ = 15660752. Its totient is φ = 7830372.

The previous prime is 11745541. The next prime is 11745581. The reversal of 11745561 is 16554711.

11745561 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 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.

It is an interprime number because it is at equal distance from previous prime (11745541) and next prime (11745581).

It is not a de Polignac number, because 11745561 - 2⁵ = 11745529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11745541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1957591 + ... + 1957596.

It is an arithmetic number, because the mean of its divisors is an integer number (3915188).

Almost surely, 2^11745561 is an apocalyptic number.

It is an amenable number.

11745561 is a deficient number, since it is larger than the sum of its proper divisors (3915191).

11745561 is an equidigital number, since it uses as much as digits as its factorization.

11745561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3915190.

The product of its digits is 4200, while the sum is 30.

The square root of 11745561 is about 3427.1797443379. The cubic root of 11745561 is about 227.3131646399.

The spelling of 11745561 in words is "eleven million, seven hundred forty-five thousand, five hundred sixty-one".