406815091 has 2 divisors, whose sum is σ = 406815092. Its totient is φ = 406815090.

The previous prime is 406815011. The next prime is 406815107. The reversal of 406815091 is 190518604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 406815091 - 2⁹ = 406814579 is a prime.

It is not a weakly prime, because it can be changed into another prime (406815001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203407545 + 203407546.

It is an arithmetic number, because the mean of its divisors is an integer number (203407546).

Almost surely, 2^406815091 is an apocalyptic number.

406815091 is a deficient number, since it is larger than the sum of its proper divisors (1).

406815091 is an equidigital number, since it uses as much as digits as its factorization.

406815091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 406815091 is about 20169.6576817754. The cubic root of 406815091 is about 740.9672590001.

The spelling of 406815091 in words is "four hundred six million, eight hundred fifteen thousand, ninety-one".