11761661 has 4 divisors (see below), whose sum is σ = 12035232. Its totient is φ = 11488092.

The previous prime is 11761657. The next prime is 11761663. The reversal of 11761661 is 16616711.

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 a cyclic number.

It is not a de Polignac number, because 11761661 - 2² = 11761657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11761663) 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, 136721 + ... + 136806.

It is an arithmetic number, because the mean of its divisors is an integer number (3008808).

Almost surely, 2^11761661 is an apocalyptic number.

It is an amenable number.

11761661 is a deficient number, since it is larger than the sum of its proper divisors (273571).

11761661 is an equidigital number, since it uses as much as digits as its factorization.

11761661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273570.

The product of its digits is 1512, while the sum is 29.

The square root of 11761661 is about 3429.5278100637. The cubic root of 11761661 is about 227.4169789249.

The spelling of 11761661 in words is "eleven million, seven hundred sixty-one thousand, six hundred sixty-one".