51865487 has 16 divisors (see below), whose sum is σ = 56609280. Its totient is φ = 47330688.

The previous prime is 51865481. The next prime is 51865507. The reversal of 51865487 is 78456815.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51865487 - 2⁶ = 51865423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51865481) 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, 110828 + ... + 111294.

It is an arithmetic number, because the mean of its divisors is an integer number (3538080).

Almost surely, 2^51865487 is an apocalyptic number.

51865487 is a deficient number, since it is larger than the sum of its proper divisors (4743793).

51865487 is a wasteful number, since it uses less digits than its factorization.

51865487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670.

The product of its digits is 268800, while the sum is 44.

The square root of 51865487 is about 7201.7697130636. The cubic root of 51865487 is about 372.9289972113.

The spelling of 51865487 in words is "fifty-one million, eight hundred sixty-five thousand, four hundred eighty-seven".