11557969 has 4 divisors (see below), whose sum is σ = 11730544. Its totient is φ = 11385396.

The previous prime is 11557963. The next prime is 11557981. The reversal of 11557969 is 96975511.

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 an emirpimes, since its reverse is a distinct semiprime: 96975511 = 677 ⋅143243.

It is a cyclic number.

It is not a de Polignac number, because 11557969 - 2³ = 11557961 is a prime.

It is a super-2 number, since 2×11557969² = 267173294809922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11557961) 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, 86187 + ... + 86320.

It is an arithmetic number, because the mean of its divisors is an integer number (2932636).

Almost surely, 2^11557969 is an apocalyptic number.

It is an amenable number.

11557969 is a deficient number, since it is larger than the sum of its proper divisors (172575).

11557969 is an equidigital number, since it uses as much as digits as its factorization.

11557969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172574.

The product of its digits is 85050, while the sum is 43.

The square root of 11557969 is about 3399.7013104095. The cubic root of 11557969 is about 226.0965011959.

It can be divided in two parts, 1155 and 7969, that multiplied together give a triangular number (9204195 = T₄₂₉₀).

The spelling of 11557969 in words is "eleven million, five hundred fifty-seven thousand, nine hundred sixty-nine".