51404431 has 8 divisors (see below), whose sum is σ = 56060480. Its totient is φ = 46848672.

The previous prime is 51404429. The next prime is 51404459. The reversal of 51404431 is 13440415.

51404431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 51404431 - 2¹ = 51404429 is a prime.

It is a super-2 number, since 2×51404431² = 5284831052867522, which 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 (51404401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24000 + ... + 26053.

It is an arithmetic number, because the mean of its divisors is an integer number (7007560).

Almost surely, 2^51404431 is an apocalyptic number.

51404431 is a deficient number, since it is larger than the sum of its proper divisors (4656049).

51404431 is a wasteful number, since it uses less digits than its factorization.

51404431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50145.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 51404431 is about 7169.6883474807. The cubic root of 51404431 is about 371.8206611374.

Adding to 51404431 its reverse (13440415), we get a palindrome (64844846).

The spelling of 51404431 in words is "fifty-one million, four hundred four thousand, four hundred thirty-one".