8357621 has 2 divisors, whose sum is σ = 8357622. Its totient is φ = 8357620.

The previous prime is 8357611. The next prime is 8357627. The reversal of 8357621 is 1267538.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7980625 + 376996 = 2825^2 + 614^2 .

It is a cyclic number.

It is not a de Polignac number, because 8357621 - 2¹⁰ = 8356597 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8357627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4178810 + 4178811.

It is an arithmetic number, because the mean of its divisors is an integer number (4178811).

Almost surely, 2^8357621 is an apocalyptic number.

It is an amenable number.

8357621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8357621 is an equidigital number, since it uses as much as digits as its factorization.

8357621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 32.

The square root of 8357621 is about 2890.9550325109. The cubic root of 8357621 is about 202.9368388034.

The spelling of 8357621 in words is "eight million, three hundred fifty-seven thousand, six hundred twenty-one".