11997569 has 8 divisors (see below), whose sum is σ = 12661440. Its totient is φ = 11336976.

The previous prime is 11997553. The next prime is 11997577. The reversal of 11997569 is 96579911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11997569 - 2⁴ = 11997553 is a prime.

It is a super-2 number, since 2×11997569² = 287883323819522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11997599) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11924 + ... + 12890.

It is an arithmetic number, because the mean of its divisors is an integer number (1582680).

Almost surely, 2^11997569 is an apocalyptic number.

11997569 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

11997569 is a deficient number, since it is larger than the sum of its proper divisors (663871).

11997569 is an equidigital number, since it uses as much as digits as its factorization.

11997569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639.

The product of its digits is 153090, while the sum is 47.

The square root of 11997569 is about 3463.7507127390. The cubic root of 11997569 is about 228.9273874648.

The spelling of 11997569 in words is "eleven million, nine hundred ninety-seven thousand, five hundred sixty-nine".