412805531681 has 4 divisors (see below), whose sum is σ = 418460402052. Its totient is φ = 407150661312.

The previous prime is 412805531623. The next prime is 412805531687. The reversal of 412805531681 is 186135508214.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 241174299025 + 171631232656 = 491095^2 + 414284^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-412805531681 is a prime.

It is a super-2 number, since 2×412805531681² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (412805531687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2827435076 + ... + 2827435221.

It is an arithmetic number, because the mean of its divisors is an integer number (104615100513).

Almost surely, 2^412805531681 is an apocalyptic number.

It is an amenable number.

412805531681 is a deficient number, since it is larger than the sum of its proper divisors (5654870371).

412805531681 is an equidigital number, since it uses as much as digits as its factorization.

412805531681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5654870370.

The product of its (nonzero) digits is 230400, while the sum is 44.

The spelling of 412805531681 in words is "four hundred twelve billion, eight hundred five million, five hundred thirty-one thousand, six hundred eighty-one".