51839487 has 16 divisors (see below), whose sum is σ = 87770880. Its totient is φ = 29622456.

The previous prime is 51839483. The next prime is 51839497. The reversal of 51839487 is 78493815.

It is not a de Polignac number, because 51839487 - 2² = 51839483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51839483) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136953 + ... + 137330.

It is an arithmetic number, because the mean of its divisors is an integer number (5485680).

Almost surely, 2^51839487 is an apocalyptic number.

51839487 is a deficient number, since it is larger than the sum of its proper divisors (35931393).

51839487 is a wasteful number, since it uses less digits than its factorization.

51839487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274299 (or 274293 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 51839487 is about 7199.9643749119. The cubic root of 51839487 is about 372.8666707642.

It can be divided in two parts, 51839 and 487, that added together give a triangular number (52326 = T₃₂₃).

The spelling of 51839487 in words is "fifty-one million, eight hundred thirty-nine thousand, four hundred eighty-seven".