51535 has 8 divisors (see below), whose sum is σ = 67536. Its totient is φ = 37440.

The previous prime is 51521. The next prime is 51539. The reversal of 51535 is 53515.

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

It is not a de Polignac number, because 51535 - 2⁵ = 51503 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 414 + ... + 523.

It is an arithmetic number, because the mean of its divisors is an integer number (8442).

2⁵¹⁵³⁵ is an apocalyptic number.

51535 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51535 is a deficient number, since it is larger than the sum of its proper divisors (16001).

51535 is a wasteful number, since it uses less digits than its factorization.

51535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953.

The product of its digits is 375, while the sum is 19.

The square root of 51535 is about 227.0132154743. The cubic root of 51535 is about 37.2135207336.

It can be divided in two parts, 5 and 1535, that added together give a triangular number (1540 = T₅₅).

The spelling of 51535 in words is "fifty-one thousand, five hundred thirty-five".