431091408721 has 4 divisors (see below), whose sum is σ = 449834513472. Its totient is φ = 412348303972.

The previous prime is 431091408689. The next prime is 431091408733. The reversal of 431091408721 is 127804190134.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 431091408721 - 2⁵ = 431091408689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (431091408791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9371552341 + ... + 9371552386.

It is an arithmetic number, because the mean of its divisors is an integer number (112458628368).

Almost surely, 2^431091408721 is an apocalyptic number.

It is an amenable number.

431091408721 is a deficient number, since it is larger than the sum of its proper divisors (18743104751).

431091408721 is a wasteful number, since it uses less digits than its factorization.

431091408721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18743104750.

The product of its (nonzero) digits is 48384, while the sum is 40.

Adding to 431091408721 its reverse (127804190134), we get a palindrome (558895598855).

The spelling of 431091408721 in words is "four hundred thirty-one billion, ninety-one million, four hundred eight thousand, seven hundred twenty-one".