11531621 has 2 divisors, whose sum is σ = 11531622. Its totient is φ = 11531620.

The previous prime is 11531617. The next prime is 11531669. The reversal of 11531621 is 12613511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6558721 + 4972900 = 2561^2 + 2230^2 .

It is a cyclic number.

It is not a de Polignac number, because 11531621 - 2² = 11531617 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 11531593 and 11531602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11531021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5765810 + 5765811.

It is an arithmetic number, because the mean of its divisors is an integer number (5765811).

Almost surely, 2^11531621 is an apocalyptic number.

It is an amenable number.

11531621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11531621 is an equidigital number, since it uses as much as digits as its factorization.

11531621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180, while the sum is 20.

The square root of 11531621 is about 3395.8240531571. The cubic root of 11531621 is about 225.9245643240.

The spelling of 11531621 in words is "eleven million, five hundred thirty-one thousand, six hundred twenty-one".