51504887 has 4 divisors (see below), whose sum is σ = 58862736. Its totient is φ = 44147040.

The previous prime is 51504881. The next prime is 51504907. The reversal of 51504887 is 78840515.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 51504887 - 2⁸ = 51504631 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51504887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51504881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3678914 + ... + 3678927.

It is an arithmetic number, because the mean of its divisors is an integer number (14715684).

Almost surely, 2^51504887 is an apocalyptic number.

51504887 is a deficient number, since it is larger than the sum of its proper divisors (7357849).

51504887 is an equidigital number, since it uses as much as digits as its factorization.

51504887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7357848.

The product of its (nonzero) digits is 44800, while the sum is 38.

The square root of 51504887 is about 7176.6905325505. The cubic root of 51504887 is about 372.0627110333.

The spelling of 51504887 in words is "fifty-one million, five hundred four thousand, eight hundred eighty-seven".