421309613 has 2 divisors, whose sum is σ = 421309614. Its totient is φ = 421309612.

The previous prime is 421309597. The next prime is 421309621. The reversal of 421309613 is 316903124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 337897924 + 83411689 = 18382^2 + 9133^2 .

It is a cyclic number.

It is not a de Polignac number, because 421309613 - 2⁴ = 421309597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421309643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210654806 + 210654807.

It is an arithmetic number, because the mean of its divisors is an integer number (210654807).

Almost surely, 2^421309613 is an apocalyptic number.

It is an amenable number.

421309613 is a deficient number, since it is larger than the sum of its proper divisors (1).

421309613 is an equidigital number, since it uses as much as digits as its factorization.

421309613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 421309613 is about 20525.8279491961. The cubic root of 421309613 is about 749.6648060675.

The spelling of 421309613 in words is "four hundred twenty-one million, three hundred nine thousand, six hundred thirteen".