51485639 has 6 divisors (see below), whose sum is σ = 54692664. Its totient is φ = 48456800.

The previous prime is 51485617. The next prime is 51485641. The reversal of 51485639 is 93658415.

It is not a de Polignac number, because 51485639 - 2²⁴ = 34708423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51485596 and 51485605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51485039) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 88787 + ... + 89364.

It is an arithmetic number, because the mean of its divisors is an integer number (9115444).

Almost surely, 2^51485639 is an apocalyptic number.

51485639 is a deficient number, since it is larger than the sum of its proper divisors (3207025).

51485639 is a wasteful number, since it uses less digits than its factorization.

51485639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178185 (or 178168 counting only the distinct ones).

The product of its digits is 129600, while the sum is 41.

The square root of 51485639 is about 7175.3493991582. The cubic root of 51485639 is about 372.0163571449.

The spelling of 51485639 in words is "fifty-one million, four hundred eighty-five thousand, six hundred thirty-nine".