51383431 has 8 divisors (see below), whose sum is σ = 56413584. Its totient is φ = 46413120.

The previous prime is 51383419. The next prime is 51383441. The reversal of 51383431 is 13438315.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51383431 - 2¹⁷ = 51252359 is a prime.

It is a super-4 number, since 4×51383431⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51383431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51383441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13150 + ... + 16603.

It is an arithmetic number, because the mean of its divisors is an integer number (7051698).

Almost surely, 2^51383431 is an apocalyptic number.

51383431 is a deficient number, since it is larger than the sum of its proper divisors (5030153).

51383431 is a wasteful number, since it uses less digits than its factorization.

51383431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29921.

The product of its digits is 4320, while the sum is 28.

The square root of 51383431 is about 7168.2236990764. The cubic root of 51383431 is about 371.7700215507.

Subtracting from 51383431 its reverse (13438315), we obtain a triangular number (37945116 = T₈₇₁₁).

The spelling of 51383431 in words is "fifty-one million, three hundred eighty-three thousand, four hundred thirty-one".