421755613 has 6 divisors (see below), whose sum is σ = 436801274. Its totient is φ = 407211504.

The previous prime is 421755611. The next prime is 421755629. The reversal of 421755613 is 316557124.

It can be written as a sum of positive squares in 3 ways, for example, as 17665209 + 404090404 = 4203^2 + 20102^2 .

It is not a de Polignac number, because 421755613 - 2¹ = 421755611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421755611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 249906 + ... + 251587.

Almost surely, 2^421755613 is an apocalyptic number.

It is an amenable number.

421755613 is a deficient number, since it is larger than the sum of its proper divisors (15045661).

421755613 is an equidigital number, since it uses as much as digits as its factorization.

421755613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501551 (or 501522 counting only the distinct ones).

The product of its digits is 25200, while the sum is 34.

The square root of 421755613 is about 20536.6894362261. The cubic root of 421755613 is about 749.9292454734.

The spelling of 421755613 in words is "four hundred twenty-one million, seven hundred fifty-five thousand, six hundred thirteen".