51472138 has 8 divisors (see below), whose sum is σ = 79091460. Its totient is φ = 25108320.

The previous prime is 51472123. The next prime is 51472163. The reversal of 51472138 is 83127415.

It can be written as a sum of positive squares in 2 ways, for example, as 39727809 + 11744329 = 6303^2 + 3427^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 313773 + ... + 313936.

Almost surely, 2^51472138 is an apocalyptic number.

51472138 is a deficient number, since it is larger than the sum of its proper divisors (27619322).

51472138 is a wasteful number, since it uses less digits than its factorization.

51472138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627752.

The product of its digits is 6720, while the sum is 31.

The square root of 51472138 is about 7174.4085470511. The cubic root of 51472138 is about 371.9838365429.

The spelling of 51472138 in words is "fifty-one million, four hundred seventy-two thousand, one hundred thirty-eight".