11521379551 has 8 divisors (see below), whose sum is σ = 12621369600. Its totient is φ = 10430154840.

The previous prime is 11521379549. The next prime is 11521379593. The reversal of 11521379551 is 15597312511.

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 11521379551 - 2¹ = 11521379549 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 (11521379501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2188581 + ... + 2193838.

It is an arithmetic number, because the mean of its divisors is an integer number (1577671200).

Almost surely, 2^11521379551 is an apocalyptic number.

11521379551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11521379551 is a deficient number, since it is larger than the sum of its proper divisors (1099990049).

11521379551 is a wasteful number, since it uses less digits than its factorization.

11521379551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4382669.

The product of its digits is 47250, while the sum is 40.

The spelling of 11521379551 in words is "eleven billion, five hundred twenty-one million, three hundred seventy-nine thousand, five hundred fifty-one".