405412691 has 2 divisors, whose sum is σ = 405412692. Its totient is φ = 405412690.

The previous prime is 405412681. The next prime is 405412717. The reversal of 405412691 is 196214504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 405412691 - 2²² = 401218387 is a prime.

It is a super-2 number, since 2×405412691² = 328718900047722962, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (405412681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202706345 + 202706346.

It is an arithmetic number, because the mean of its divisors is an integer number (202706346).

Almost surely, 2^405412691 is an apocalyptic number.

405412691 is a deficient number, since it is larger than the sum of its proper divisors (1).

405412691 is an equidigital number, since it uses as much as digits as its factorization.

405412691 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 32.

The square root of 405412691 is about 20134.8625771322. The cubic root of 405412691 is about 740.1148415631.

The spelling of 405412691 in words is "four hundred five million, four hundred twelve thousand, six hundred ninety-one".