11997761 has 4 divisors (see below), whose sum is σ = 12004692. Its totient is φ = 11990832.

The previous prime is 11997751. The next prime is 11997787. The reversal of 11997761 is 16779911.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7507600 + 4490161 = 2740^2 + 2119^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11997761 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11997751) 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, 1595 + ... + 5151.

It is an arithmetic number, because the mean of its divisors is an integer number (3001173).

Almost surely, 2^11997761 is an apocalyptic number.

It is an amenable number.

11997761 is a deficient number, since it is larger than the sum of its proper divisors (6931).

11997761 is an equidigital number, since it uses as much as digits as its factorization.

11997761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6930.

The product of its digits is 23814, while the sum is 41.

The square root of 11997761 is about 3463.7784282486. The cubic root of 11997761 is about 228.9286086517.

The spelling of 11997761 in words is "eleven million, nine hundred ninety-seven thousand, seven hundred sixty-one".