431383578821 has 4 divisors (see below), whose sum is σ = 464566931052. Its totient is φ = 398200226592.

The previous prime is 431383578817. The next prime is 431383578859. The reversal of 431383578821 is 128875383134.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128875383134 = 2 ⋅64437691567.

It can be written as a sum of positive squares in 2 ways, for example, as 57223816225 + 374159762596 = 239215^2 + 611686^2 .

It is a cyclic number.

It is not a de Polignac number, because 431383578821 - 2² = 431383578817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431383578881) 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 in 3 ways as a sum of consecutive naturals, for example, 16591676096 + ... + 16591676121.

It is an arithmetic number, because the mean of its divisors is an integer number (116141732763).

Almost surely, 2^431383578821 is an apocalyptic number.

It is an amenable number.

431383578821 is a deficient number, since it is larger than the sum of its proper divisors (33183352231).

431383578821 is a wasteful number, since it uses less digits than its factorization.

431383578821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33183352230.

The product of its digits is 3870720, while the sum is 53.

The spelling of 431383578821 in words is "four hundred thirty-one billion, three hundred eighty-three million, five hundred seventy-eight thousand, eight hundred twenty-one".