406622509 has 2 divisors, whose sum is σ = 406622510. Its totient is φ = 406622508.

The previous prime is 406622479. The next prime is 406622537. The reversal of 406622509 is 905226604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 400120009 + 6502500 = 20003^2 + 2550^2 .

It is a cyclic number.

It is not a de Polignac number, because 406622509 - 2¹³ = 406614317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406622539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203311254 + 203311255.

It is an arithmetic number, because the mean of its divisors is an integer number (203311255).

Almost surely, 2^406622509 is an apocalyptic number.

It is an amenable number.

406622509 is a deficient number, since it is larger than the sum of its proper divisors (1).

406622509 is an equidigital number, since it uses as much as digits as its factorization.

406622509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 406622509 is about 20164.8830643770. The cubic root of 406622509 is about 740.8503185007.

The spelling of 406622509 in words is "four hundred six million, six hundred twenty-two thousand, five hundred nine".