11851621 has 2 divisors, whose sum is σ = 11851622. Its totient is φ = 11851620.

The previous prime is 11851613. The next prime is 11851639. The reversal of 11851621 is 12615811.

It is a happy number.

11851621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11189025 + 662596 = 3345^2 + 814^2 .

It is a cyclic number.

It is not a de Polignac number, because 11851621 - 2³ = 11851613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11851681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5925810 + 5925811.

It is an arithmetic number, because the mean of its divisors is an integer number (5925811).

Almost surely, 2^11851621 is an apocalyptic number.

It is an amenable number.

11851621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11851621 is an equidigital number, since it uses as much as digits as its factorization.

11851621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 25.

The square root of 11851621 is about 3442.6183349306. The cubic root of 11851621 is about 227.9953125639.

The spelling of 11851621 in words is "eleven million, eight hundred fifty-one thousand, six hundred twenty-one".