11787641 has 4 divisors (see below), whose sum is σ = 11797632. Its totient is φ = 11777652.

The previous prime is 11787637. The next prime is 11787649. The reversal of 11787641 is 14678711.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 14678711 = 47 ⋅312313.

It is a cyclic number.

It is not a de Polignac number, because 11787641 - 2² = 11787637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11787649) 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, 2945 + ... + 5678.

It is an arithmetic number, because the mean of its divisors is an integer number (2949408).

Almost surely, 2^11787641 is an apocalyptic number.

It is an amenable number.

11787641 is a deficient number, since it is larger than the sum of its proper divisors (9991).

11787641 is an equidigital number, since it uses as much as digits as its factorization.

11787641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9990.

The product of its digits is 9408, while the sum is 35.

The square root of 11787641 is about 3433.3134141817. The cubic root of 11787641 is about 227.5843007632.

The spelling of 11787641 in words is "eleven million, seven hundred eighty-seven thousand, six hundred forty-one".