409621213 has 2 divisors, whose sum is σ = 409621214. Its totient is φ = 409621212.

The previous prime is 409621127. The next prime is 409621217. The reversal of 409621213 is 312126904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 327863449 + 81757764 = 18107^2 + 9042^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-409621213 is a prime.

It is equal to p_21821554 and since 409621213 and 21821554 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409621217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204810606 + 204810607.

It is an arithmetic number, because the mean of its divisors is an integer number (204810607).

Almost surely, 2^409621213 is an apocalyptic number.

It is an amenable number.

409621213 is a deficient number, since it is larger than the sum of its proper divisors (1).

409621213 is an equidigital number, since it uses as much as digits as its factorization.

409621213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 409621213 is about 20239.1010916987. The cubic root of 409621213 is about 742.6670337328.

The spelling of 409621213 in words is "four hundred nine million, six hundred twenty-one thousand, two hundred thirteen".