11989551 has 32 divisors (see below), whose sum is σ = 19456000. Its totient is φ = 6415200.

The previous prime is 11989547. The next prime is 11989553. The reversal of 11989551 is 15598911.

It is not a de Polignac number, because 11989551 - 2² = 11989547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11989553) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60150 + ... + 60348.

It is an arithmetic number, because the mean of its divisors is an integer number (608000).

Almost surely, 2^11989551 is an apocalyptic number.

11989551 is a deficient number, since it is larger than the sum of its proper divisors (7466449).

11989551 is a wasteful number, since it uses less digits than its factorization.

11989551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379.

The product of its digits is 16200, while the sum is 39.

The square root of 11989551 is about 3462.5931034414. The cubic root of 11989551 is about 228.8763785522.

The spelling of 11989551 in words is "eleven million, nine hundred eighty-nine thousand, five hundred fifty-one".