11782521 has 12 divisors (see below), whose sum is σ = 17259840. Its totient is φ = 7743960.

The previous prime is 11782501. The next prime is 11782523. The reversal of 11782521 is 12528711.

It is not a de Polignac number, because 11782521 - 2¹⁵ = 11749753 is a prime.

It is a super-2 number, since 2×11782521² = 277655602230882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11782523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8581 + ... + 9858.

It is an arithmetic number, because the mean of its divisors is an integer number (1438320).

Almost surely, 2^11782521 is an apocalyptic number.

It is an amenable number.

11782521 is a deficient number, since it is larger than the sum of its proper divisors (5477319).

11782521 is a wasteful number, since it uses less digits than its factorization.

11782521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18516 (or 18513 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 11782521 is about 3432.5676978029. The cubic root of 11782521 is about 227.5513453323.

The spelling of 11782521 in words is "eleven million, seven hundred eighty-two thousand, five hundred twenty-one".