102545545 has 4 divisors (see below), whose sum is σ = 123054660. Its totient is φ = 82036432.

The previous prime is 102545539. The next prime is 102545563. The reversal of 102545545 is 545545201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545545201 = 3089 ⋅176609.

It can be written as a sum of positive squares in 2 ways, for example, as 51322896 + 51222649 = 7164^2 + 7157^2 .

It is a cyclic number.

It is not a de Polignac number, because 102545545 - 2²⁵ = 68991113 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10254550 + ... + 10254559.

It is an arithmetic number, because the mean of its divisors is an integer number (30763665).

Almost surely, 2^102545545 is an apocalyptic number.

It is an amenable number.

102545545 is a deficient number, since it is larger than the sum of its proper divisors (20509115).

102545545 is an equidigital number, since it uses as much as digits as its factorization.

102545545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20509114.

The product of its (nonzero) digits is 20000, while the sum is 31.

The square root of 102545545 is about 10126.4774230726. The cubic root of 102545545 is about 468.0643874326.

The spelling of 102545545 in words is "one hundred two million, five hundred forty-five thousand, five hundred forty-five".