8420651 has 2 divisors, whose sum is σ = 8420652. Its totient is φ = 8420650.

The previous prime is 8420603. The next prime is 8420653. The reversal of 8420651 is 1560248.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8420651 is a prime.

It is a Sophie Germain prime.

Together with 8420653, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8420651.

It is not a weakly prime, because it can be changed into another prime (8420653) 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, 4210325 + 4210326.

It is an arithmetic number, because the mean of its divisors is an integer number (4210326).

Almost surely, 2^8420651 is an apocalyptic number.

8420651 is a deficient number, since it is larger than the sum of its proper divisors (1).

8420651 is an equidigital number, since it uses as much as digits as its factorization.

8420651 is an odious number, because the sum of its binary digits is odd.

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

The square root of 8420651 is about 2901.8357982491. The cubic root of 8420651 is about 203.4457191723.

Adding to 8420651 its reverse (1560248), we get a palindrome (9980899).

The spelling of 8420651 in words is "eight million, four hundred twenty thousand, six hundred fifty-one".