406481591 has 2 divisors, whose sum is σ = 406481592. Its totient is φ = 406481590.

The previous prime is 406481587. The next prime is 406481597. The reversal of 406481591 is 195184604.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 406481591 - 2² = 406481587 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406481597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203240795 + 203240796.

It is an arithmetic number, because the mean of its divisors is an integer number (203240796).

Almost surely, 2^406481591 is an apocalyptic number.

406481591 is a deficient number, since it is larger than the sum of its proper divisors (1).

406481591 is an equidigital number, since it uses as much as digits as its factorization.

406481591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 406481591 is about 20161.3886178507. The cubic root of 406481591 is about 740.7647262497.

The spelling of 406481591 in words is "four hundred six million, four hundred eighty-one thousand, five hundred ninety-one".