51321744349 has 4 divisors (see below), whose sum is σ = 51323655580. Its totient is φ = 51319833120.

The previous prime is 51321744323. The next prime is 51321744407. The reversal of 51321744349 is 94344712315.

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 41608656324 + 9713088025 = 203982^2 + 98555^2 .

It is a cyclic number.

It is not a de Polignac number, because 51321744349 - 2³⁵ = 16962005981 is a prime.

It is a super-2 number, since 2×51321744349² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51321844349) 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, 914754 + ... + 969235.

It is an arithmetic number, because the mean of its divisors is an integer number (12830913895).

Almost surely, 2^51321744349 is an apocalyptic number.

It is an amenable number.

51321744349 is a deficient number, since it is larger than the sum of its proper divisors (1911231).

51321744349 is a wasteful number, since it uses less digits than its factorization.

51321744349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911230.

The product of its digits is 362880, while the sum is 43.

The spelling of 51321744349 in words is "fifty-one billion, three hundred twenty-one million, seven hundred forty-four thousand, three hundred forty-nine".