51485139 has 12 divisors (see below), whose sum is σ = 77122136. Its totient is φ = 34323264.

The previous prime is 51485131. The next prime is 51485171. The reversal of 51485139 is 93158415.

51485139 is a `hidden beast` number, since 514 + 8 + 5 + 139 = 666.

51485139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51485139 - 2³ = 51485131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51485131) 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 11 ways as a sum of consecutive naturals, for example, 105694 + ... + 106179.

Almost surely, 2^51485139 is an apocalyptic number.

51485139 is a deficient number, since it is larger than the sum of its proper divisors (25636997).

51485139 is an equidigital number, since it uses as much as digits as its factorization.

51485139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211888 (or 211876 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 51485139 is about 7175.3145575647. The cubic root of 51485139 is about 372.0151528687.

The spelling of 51485139 in words is "fifty-one million, four hundred eighty-five thousand, one hundred thirty-nine".