51438019 has 8 divisors (see below), whose sum is σ = 52918272. Its totient is φ = 49970760.

The previous prime is 51438011. The next prime is 51438031. The reversal of 51438019 is 91083415.

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 51438019 - 2³ = 51438011 is a prime.

It is a super-2 number, since 2×51438019² = 5291739597288722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51438011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5082 + ... + 11344.

It is an arithmetic number, because the mean of its divisors is an integer number (6614784).

Almost surely, 2^51438019 is an apocalyptic number.

51438019 is a deficient number, since it is larger than the sum of its proper divisors (1480253).

51438019 is a wasteful number, since it uses less digits than its factorization.

51438019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6497.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 51438019 is about 7172.0303262047. The cubic root of 51438019 is about 371.9016268767.

The spelling of 51438019 in words is "fifty-one million, four hundred thirty-eight thousand, nineteen".