102545 has 4 divisors (see below), whose sum is σ = 123060. Its totient is φ = 82032.

The previous prime is 102539. The next prime is 102547. The reversal of 102545 is 545201.

102545 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545201 = 457 ⋅1193.

It can be written as a sum of positive squares in 2 ways, for example, as 28561 + 73984 = 169^2 + 272^2 .

It is a cyclic number.

It is not a de Polignac number, because 102545 - 2⁶ = 102481 is a prime.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 102545.

It is not an unprimeable number, because it can be changed into a prime (102547) 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, 10250 + ... + 10259.

It is an arithmetic number, because the mean of its divisors is an integer number (30765).

2¹⁰²⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

102545 is a deficient number, since it is larger than the sum of its proper divisors (20515).

102545 is an equidigital number, since it uses as much as digits as its factorization.

102545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20514.

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 102545 is about 320.2264823527. The cubic root of 102545 is about 46.8063558222.

Adding to 102545 its reverse (545201), we get a palindrome (647746).

The spelling of 102545 in words is "one hundred two thousand, five hundred forty-five".