11528551 has 4 divisors (see below), whose sum is σ = 11549592. Its totient is φ = 11507512.

The previous prime is 11528537. The next prime is 11528563. The reversal of 11528551 is 15582511.

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 11528551 - 2⁵ = 11528519 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 (11528581) 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, 9676 + ... + 10801.

It is an arithmetic number, because the mean of its divisors is an integer number (2887398).

Almost surely, 2^11528551 is an apocalyptic number.

11528551 is a deficient number, since it is larger than the sum of its proper divisors (21041).

11528551 is an equidigital number, since it uses as much as digits as its factorization.

11528551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21040.

The product of its digits is 2000, while the sum is 28.

The square root of 11528551 is about 3395.3719972928. The cubic root of 11528551 is about 225.9045136601.

The spelling of 11528551 in words is "eleven million, five hundred twenty-eight thousand, five hundred fifty-one".