11981359 has 4 divisors (see below), whose sum is σ = 12903016. Its totient is φ = 11059704.

The previous prime is 11981357. The next prime is 11981363. The reversal of 11981359 is 95318911.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 11981359 - 2¹ = 11981357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11981353) 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, 460809 + ... + 460834.

It is an arithmetic number, because the mean of its divisors is an integer number (3225754).

Almost surely, 2^11981359 is an apocalyptic number.

11981359 is a deficient number, since it is larger than the sum of its proper divisors (921657).

11981359 is an equidigital number, since it uses as much as digits as its factorization.

11981359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921656.

The product of its digits is 9720, while the sum is 37.

The square root of 11981359 is about 3461.4099728290. The cubic root of 11981359 is about 228.8242391940.

The spelling of 11981359 in words is "eleven million, nine hundred eighty-one thousand, three hundred fifty-nine".