405491071 has 2 divisors, whose sum is σ = 405491072. Its totient is φ = 405491070.

The previous prime is 405491069. The next prime is 405491101. The reversal of 405491071 is 170194504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 405491071 - 2¹ = 405491069 is a prime.

Together with 405491069, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405491041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202745535 + 202745536.

It is an arithmetic number, because the mean of its divisors is an integer number (202745536).

Almost surely, 2^405491071 is an apocalyptic number.

405491071 is a deficient number, since it is larger than the sum of its proper divisors (1).

405491071 is an equidigital number, since it uses as much as digits as its factorization.

405491071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 405491071 is about 20136.8088584065. The cubic root of 405491071 is about 740.1625349091.

The spelling of 405491071 in words is "four hundred five million, four hundred ninety-one thousand, seventy-one".