406418261 has 2 divisors, whose sum is σ = 406418262. Its totient is φ = 406418260.

The previous prime is 406418251. The next prime is 406418279. The reversal of 406418261 is 162814604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207072100 + 199346161 = 14390^2 + 14119^2 .

It is a cyclic number.

It is not a de Polignac number, because 406418261 - 2⁶ = 406418197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406418251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203209130 + 203209131.

It is an arithmetic number, because the mean of its divisors is an integer number (203209131).

Almost surely, 2^406418261 is an apocalyptic number.

It is an amenable number.

406418261 is a deficient number, since it is larger than the sum of its proper divisors (1).

406418261 is an equidigital number, since it uses as much as digits as its factorization.

406418261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 406418261 is about 20159.8179803291. The cubic root of 406418261 is about 740.7262537680.

The spelling of 406418261 in words is "four hundred six million, four hundred eighteen thousand, two hundred sixty-one".