11921559 has 16 divisors (see below), whose sum is σ = 17203200. Its totient is φ = 7299936.

The previous prime is 11921543. The next prime is 11921587. The reversal of 11921559 is 95512911.

It is a happy number.

It is not a de Polignac number, because 11921559 - 2⁴ = 11921543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11921519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8682 + ... + 9960.

It is an arithmetic number, because the mean of its divisors is an integer number (1075200).

Almost surely, 2^11921559 is an apocalyptic number.

11921559 is a deficient number, since it is larger than the sum of its proper divisors (5281641).

11921559 is a wasteful number, since it uses less digits than its factorization.

11921559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534.

The product of its digits is 4050, while the sum is 33.

The square root of 11921559 is about 3452.7610690576. The cubic root of 11921559 is about 228.4429102109.

The spelling of 11921559 in words is "eleven million, nine hundred twenty-one thousand, five hundred fifty-nine".