51545 has 12 divisors (see below), whose sum is σ = 68076. Its totient is φ = 37440.

The previous prime is 51539. The next prime is 51551. The reversal of 51545 is 54515.

51545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51539) and next prime (51551).

It can be written as a sum of positive squares in 6 ways, for example, as 24649 + 26896 = 157^2 + 164^2 .

It is not a de Polignac number, because 51545 - 2⁶ = 51481 is a prime.

It is a Smith number, since the sum of its digits (20) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a plaindrome in base 11.

It is a nialpdrome in base 9.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 815 + ... + 875.

It is an arithmetic number, because the mean of its divisors is an integer number (5673).

2⁵¹⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

51545 is a deficient number, since it is larger than the sum of its proper divisors (16531).

51545 is a wasteful number, since it uses less digits than its factorization.

51545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 79 counting only the distinct ones).

The product of its digits is 500, while the sum is 20.

The square root of 51545 is about 227.0352395554. The cubic root of 51545 is about 37.2159275842.

The spelling of 51545 in words is "fifty-one thousand, five hundred forty-five".