421553317 has 2 divisors, whose sum is σ = 421553318. Its totient is φ = 421553316.

The previous prime is 421553311. The next prime is 421553329. The reversal of 421553317 is 713355124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 368102596 + 53450721 = 19186^2 + 7311^2 .

It is a cyclic number.

It is not a de Polignac number, because 421553317 - 2⁷ = 421553189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421553311) 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, 210776658 + 210776659.

It is an arithmetic number, because the mean of its divisors is an integer number (210776659).

Almost surely, 2^421553317 is an apocalyptic number.

It is an amenable number.

421553317 is a deficient number, since it is larger than the sum of its proper divisors (1).

421553317 is an equidigital number, since it uses as much as digits as its factorization.

421553317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12600, while the sum is 31.

The square root of 421553317 is about 20531.7636115362. The cubic root of 421553317 is about 749.8093245650.

The spelling of 421553317 in words is "four hundred twenty-one million, five hundred fifty-three thousand, three hundred seventeen".