11981959 has 8 divisors (see below), whose sum is σ = 13522320. Its totient is φ = 10516800.

The previous prime is 11981941. The next prime is 11981971. The reversal of 11981959 is 95918911.

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 11981959 - 2⁷ = 11981831 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 (11981909) 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 7 ways as a sum of consecutive naturals, for example, 18462 + ... + 19099.

It is an arithmetic number, because the mean of its divisors is an integer number (1690290).

Almost surely, 2^11981959 is an apocalyptic number.

11981959 is a deficient number, since it is larger than the sum of its proper divisors (1540361).

11981959 is a wasteful number, since it uses less digits than its factorization.

11981959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37601.

The product of its digits is 29160, while the sum is 43.

The square root of 11981959 is about 3461.4966416277. The cubic root of 11981959 is about 228.8280588011.

The spelling of 11981959 in words is "eleven million, nine hundred eighty-one thousand, nine hundred fifty-nine".