11781697 has 4 divisors (see below), whose sum is σ = 12474756. Its totient is φ = 11088640.

The previous prime is 11781673. The next prime is 11781703. The reversal of 11781697 is 79618711.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7817616 + 3964081 = 2796^2 + 1991^2 .

It is a cyclic number.

It is not a de Polignac number, because 11781697 - 2¹⁹ = 11257409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11781617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346504 + ... + 346537.

It is an arithmetic number, because the mean of its divisors is an integer number (3118689).

Almost surely, 2^11781697 is an apocalyptic number.

11781697 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

11781697 is a deficient number, since it is larger than the sum of its proper divisors (693059).

11781697 is an equidigital number, since it uses as much as digits as its factorization.

11781697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693058.

The product of its digits is 21168, while the sum is 40.

The square root of 11781697 is about 3432.4476689383. The cubic root of 11781697 is about 227.5460406758.

The spelling of 11781697 in words is "eleven million, seven hundred eighty-one thousand, six hundred ninety-seven".