51501 has 4 divisors (see below), whose sum is σ = 68672. Its totient is φ = 34332.

The previous prime is 51487. The next prime is 51503. The reversal of 51501 is 10515.

51501 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51501 - 2⁶ = 51437 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51503) 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, 8581 + ... + 8586.

It is an arithmetic number, because the mean of its divisors is an integer number (17168).

2⁵¹⁵⁰¹ is an apocalyptic number.

It is an amenable number.

51501 is a deficient number, since it is larger than the sum of its proper divisors (17171).

51501 is a wasteful number, since it uses less digits than its factorization.

51501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17170.

The product of its (nonzero) digits is 25, while the sum is 12.

The square root of 51501 is about 226.9383176108. The cubic root of 51501 is about 37.2053351118.

It can be divided in two parts, 5150 and 1, that added together give a triangular number (5151 = T₁₀₁).

The spelling of 51501 in words is "fifty-one thousand, five hundred one".