8428691 has 2 divisors, whose sum is σ = 8428692. Its totient is φ = 8428690.

The previous prime is 8428687. The next prime is 8428697. The reversal of 8428691 is 1968248.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8428691 - 2² = 8428687 is a prime.

It is not a weakly prime, because it can be changed into another prime (8428697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4214345 + 4214346.

It is an arithmetic number, because the mean of its divisors is an integer number (4214346).

Almost surely, 2^8428691 is an apocalyptic number.

8428691 is a deficient number, since it is larger than the sum of its proper divisors (1).

8428691 is an equidigital number, since it uses as much as digits as its factorization.

8428691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 38.

The square root of 8428691 is about 2903.2207976659. The cubic root of 8428691 is about 203.5104482639.

It can be divided in two parts, 8428 and 691, that added together give a palindrome (9119).

The spelling of 8428691 in words is "eight million, four hundred twenty-eight thousand, six hundred ninety-one".