51954439321 has 4 divisors (see below), whose sum is σ = 52081467700. Its totient is φ = 51827410944.

The previous prime is 51954439297. The next prime is 51954439337. The reversal of 51954439321 is 12393445915.

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 25972545600 + 25981893721 = 161160^2 + 161189^2 .

It is a cyclic number.

It is not a de Polignac number, because 51954439321 - 2¹³ = 51954431129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51954449321) 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, 63513576 + ... + 63514393.

It is an arithmetic number, because the mean of its divisors is an integer number (13020366925).

Almost surely, 2^51954439321 is an apocalyptic number.

It is an amenable number.

51954439321 is a deficient number, since it is larger than the sum of its proper divisors (127028379).

51954439321 is a wasteful number, since it uses less digits than its factorization.

51954439321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127028378.

The product of its digits is 583200, while the sum is 46.

The spelling of 51954439321 in words is "fifty-one billion, nine hundred fifty-four million, four hundred thirty-nine thousand, three hundred twenty-one".