11978569 has 4 divisors (see below), whose sum is σ = 12609040. Its totient is φ = 11348100.

The previous prime is 11978567. The next prime is 11978573. The reversal of 11978569 is 96587911.

It is a happy number.

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 11978569 - 2¹ = 11978567 is a prime.

It is a super-2 number, since 2×11978569² = 286972230575522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11978567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315207 + ... + 315244.

It is an arithmetic number, because the mean of its divisors is an integer number (3152260).

Almost surely, 2^11978569 is an apocalyptic number.

11978569 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

11978569 is a deficient number, since it is larger than the sum of its proper divisors (630471).

11978569 is an equidigital number, since it uses as much as digits as its factorization.

11978569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630470.

The product of its digits is 136080, while the sum is 46.

The square root of 11978569 is about 3461.0069344051. The cubic root of 11978569 is about 228.8064763457.

The spelling of 11978569 in words is "eleven million, nine hundred seventy-eight thousand, five hundred sixty-nine".