8540621 has 2 divisors, whose sum is σ = 8540622. Its totient is φ = 8540620.

The previous prime is 8540573. The next prime is 8540629. The reversal of 8540621 is 1260458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7562500 + 978121 = 2750^2 + 989^2 .

It is a cyclic number.

It is not a de Polignac number, because 8540621 - 2¹⁸ = 8278477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8540629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4270310 + 4270311.

It is an arithmetic number, because the mean of its divisors is an integer number (4270311).

Almost surely, 2^8540621 is an apocalyptic number.

It is an amenable number.

8540621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8540621 is an equidigital number, since it uses as much as digits as its factorization.

8540621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 8540621 is about 2922.4340882217. The cubic root of 8540621 is about 204.4073384160.

The spelling of 8540621 in words is "eight million, five hundred forty thousand, six hundred twenty-one".