8542621 has 2 divisors, whose sum is σ = 8542622. Its totient is φ = 8542620.

The previous prime is 8542603. The next prime is 8542631. The reversal of 8542621 is 1262458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7128900 + 1413721 = 2670^2 + 1189^2 .

It is a cyclic number.

It is not a de Polignac number, because 8542621 - 2⁷ = 8542493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8542621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8542601) 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 as a sum of consecutive naturals, namely, 4271310 + 4271311.

It is an arithmetic number, because the mean of its divisors is an integer number (4271311).

Almost surely, 2^8542621 is an apocalyptic number.

It is an amenable number.

8542621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8542621 is an equidigital number, since it uses as much as digits as its factorization.

8542621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 28.

The square root of 8542621 is about 2922.7762487060. The cubic root of 8542621 is about 204.4232928675.

The spelling of 8542621 in words is "eight million, five hundred forty-two thousand, six hundred twenty-one".