11612521 has 4 divisors (see below), whose sum is σ = 11621844. Its totient is φ = 11603200.

The previous prime is 11612519. The next prime is 11612527. The reversal of 11612521 is 12521611.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12521611 = 691 ⋅18121.

It can be written as a sum of positive squares in 2 ways, for example, as 4515625 + 7096896 = 2125^2 + 2664^2 .

It is a cyclic number.

It is not a de Polignac number, because 11612521 - 2¹ = 11612519 is a prime.

It is a super-4 number, since 4×11612521⁴ (a number of 29 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11612527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2440 + ... + 5401.

It is an arithmetic number, because the mean of its divisors is an integer number (2905461).

Almost surely, 2^11612521 is an apocalyptic number.

It is an amenable number.

11612521 is a deficient number, since it is larger than the sum of its proper divisors (9323).

11612521 is an equidigital number, since it uses as much as digits as its factorization.

11612521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9322.

The product of its digits is 120, while the sum is 19.

The square root of 11612521 is about 3407.7149235228. The cubic root of 11612521 is about 226.4516576572.

The spelling of 11612521 in words is "eleven million, six hundred twelve thousand, five hundred twenty-one".