47431681321 has 4 divisors (see below), whose sum is σ = 48713618692. Its totient is φ = 46149743952.

The previous prime is 47431681273. The next prime is 47431681327. The reversal of 47431681321 is 12318613474.

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 44152515625 + 3279165696 = 210125^2 + 57264^2 .

It is a cyclic number.

It is not a de Polignac number, because 47431681321 - 2²⁵ = 47398126889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47431681327) 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, 640968630 + ... + 640968703.

It is an arithmetic number, because the mean of its divisors is an integer number (12178404673).

Almost surely, 2^47431681321 is an apocalyptic number.

It is an amenable number.

47431681321 is a deficient number, since it is larger than the sum of its proper divisors (1281937371).

47431681321 is a wasteful number, since it uses less digits than its factorization.

47431681321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281937370.

The product of its digits is 96768, while the sum is 40.

The spelling of 47431681321 in words is "forty-seven billion, four hundred thirty-one million, six hundred eighty-one thousand, three hundred twenty-one".