8421577 has 2 divisors, whose sum is σ = 8421578. Its totient is φ = 8421576.

The previous prime is 8421563. The next prime is 8421587. The reversal of 8421577 is 7751248.

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., 8415801 + 5776 = 2901^2 + 76^2 .

It is a cyclic number.

It is not a de Polignac number, because 8421577 - 2²³ = 32969 is a prime.

It is not a weakly prime, because it can be changed into another prime (8421547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4210788 + 4210789.

It is an arithmetic number, because the mean of its divisors is an integer number (4210789).

Almost surely, 2^8421577 is an apocalyptic number.

It is an amenable number.

8421577 is a deficient number, since it is larger than the sum of its proper divisors (1).

8421577 is an equidigital number, since it uses as much as digits as its factorization.

8421577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15680, while the sum is 34.

The square root of 8421577 is about 2901.9953480321. The cubic root of 8421577 is about 203.4531763879.

It can be divided in two parts, 8421 and 577, that added together give a palindrome (8998).

The spelling of 8421577 in words is "eight million, four hundred twenty-one thousand, five hundred seventy-seven".