51642505 has 8 divisors (see below), whose sum is σ = 62069832. Its totient is φ = 41248128.

The previous prime is 51642457. The next prime is 51642529. The reversal of 51642505 is 50524615.

It can be written as a sum of positive squares in 4 ways, for example, as 8042896 + 43599609 = 2836^2 + 6603^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51642505 - 2¹⁵ = 51609737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4644 + ... + 11173.

It is an arithmetic number, because the mean of its divisors is an integer number (7758729).

Almost surely, 2^51642505 is an apocalyptic number.

It is an amenable number.

51642505 is a deficient number, since it is larger than the sum of its proper divisors (10427327).

51642505 is a wasteful number, since it uses less digits than its factorization.

51642505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16475.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 51642505 is about 7186.2719820502. The cubic root of 51642505 is about 372.3937928222.

The spelling of 51642505 in words is "fifty-one million, six hundred forty-two thousand, five hundred five".