51446139 has 16 divisors (see below), whose sum is σ = 69750912. Its totient is φ = 33723648.

The previous prime is 51446137. The next prime is 51446149. The reversal of 51446139 is 93164415.

51446139 = T₆₂ + T₆₃ + ... + T₆₇₅.

It is not a de Polignac number, because 51446139 - 2¹ = 51446137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51446137) 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 15 ways as a sum of consecutive naturals, for example, 76107 + ... + 76779.

It is an arithmetic number, because the mean of its divisors is an integer number (4359432).

Almost surely, 2^51446139 is an apocalyptic number.

51446139 is a deficient number, since it is larger than the sum of its proper divisors (18304773).

51446139 is a wasteful number, since it uses less digits than its factorization.

51446139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066.

The product of its digits is 12960, while the sum is 33.

The square root of 51446139 is about 7172.5963918235. The cubic root of 51446139 is about 371.9211952970.

The spelling of 51446139 in words is "fifty-one million, four hundred forty-six thousand, one hundred thirty-nine".