405450491 has 2 divisors, whose sum is σ = 405450492. Its totient is φ = 405450490.

The previous prime is 405450473. The next prime is 405450511. The reversal of 405450491 is 194054504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 405450491 - 2⁶ = 405450427 is a prime.

It is not a weakly prime, because it can be changed into another prime (405450431) 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, 202725245 + 202725246.

It is an arithmetic number, because the mean of its divisors is an integer number (202725246).

Almost surely, 2^405450491 is an apocalyptic number.

405450491 is a deficient number, since it is larger than the sum of its proper divisors (1).

405450491 is an equidigital number, since it uses as much as digits as its factorization.

405450491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 405450491 is about 20135.8012256776. The cubic root of 405450491 is about 740.1378432041.

It can be divided in two parts, 4054 and 50491, that added together give a palindrome (54545).

The spelling of 405450491 in words is "four hundred five million, four hundred fifty thousand, four hundred ninety-one".