11562989 has 4 divisors (see below), whose sum is σ = 11725920. Its totient is φ = 11400060.

The previous prime is 11562983. The next prime is 11563003. The reversal of 11562989 is 98926511.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98926511 = 29 ⋅3411259.

It is a cyclic number.

It is not a de Polignac number, because 11562989 - 2⁴ = 11562973 is a prime.

It is a super-2 number, since 2×11562989² = 267405429228242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11562983) 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, 81359 + ... + 81500.

It is an arithmetic number, because the mean of its divisors is an integer number (2931480).

Almost surely, 2^11562989 is an apocalyptic number.

It is an amenable number.

11562989 is a deficient number, since it is larger than the sum of its proper divisors (162931).

11562989 is an equidigital number, since it uses as much as digits as its factorization.

11562989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162930.

The product of its digits is 38880, while the sum is 41.

The square root of 11562989 is about 3400.4395304137. The cubic root of 11562989 is about 226.1292301339.

The spelling of 11562989 in words is "eleven million, five hundred sixty-two thousand, nine hundred eighty-nine".