11541621 has 32 divisors (see below), whose sum is σ = 19253248. Its totient is φ = 5987520.

The previous prime is 11541617. The next prime is 11541631. The reversal of 11541621 is 12614511.

It is not a de Polignac number, because 11541621 - 2² = 11541617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11541601) 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 31 ways as a sum of consecutive naturals, for example, 17976 + ... + 18606.

It is an arithmetic number, because the mean of its divisors is an integer number (601664).

Almost surely, 2^11541621 is an apocalyptic number.

It is an amenable number.

11541621 is a deficient number, since it is larger than the sum of its proper divisors (7711627).

11541621 is a wasteful number, since it uses less digits than its factorization.

11541621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721.

The product of its digits is 240, while the sum is 21.

The square root of 11541621 is about 3397.2961307487. The cubic root of 11541621 is about 225.9898512685.

It can be divided in two parts, 1154 and 1621, that added together give a triangular number (2775 = T₇₄).

The spelling of 11541621 in words is "eleven million, five hundred forty-one thousand, six hundred twenty-one".