408118261 has 2 divisors, whose sum is σ = 408118262. Its totient is φ = 408118260.

The previous prime is 408118241. The next prime is 408118267. The reversal of 408118261 is 162811804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 353816100 + 54302161 = 18810^2 + 7369^2 .

It is a cyclic number.

It is not a de Polignac number, because 408118261 - 2¹¹ = 408116213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408118267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204059130 + 204059131.

It is an arithmetic number, because the mean of its divisors is an integer number (204059131).

Almost surely, 2^408118261 is an apocalyptic number.

It is an amenable number.

408118261 is a deficient number, since it is larger than the sum of its proper divisors (1).

408118261 is an equidigital number, since it uses as much as digits as its factorization.

408118261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 408118261 is about 20201.9370605890. The cubic root of 408118261 is about 741.7576074883.

The spelling of 408118261 in words is "four hundred eight million, one hundred eighteen thousand, two hundred sixty-one".