102845561 has 12 divisors (see below), whose sum is σ = 128840292. Its totient is φ = 81371808.

The previous prime is 102845557. The next prime is 102845591. The reversal of 102845561 is 165548201.

It can be written as a sum of positive squares in 2 ways, for example, as 55785961 + 47059600 = 7469^2 + 6860^2 .

It is not a de Polignac number, because 102845561 - 2² = 102845557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102845521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80090 + ... + 81363.

It is an arithmetic number, because the mean of its divisors is an integer number (10736691).

Almost surely, 2^102845561 is an apocalyptic number.

It is an amenable number.

102845561 is a deficient number, since it is larger than the sum of its proper divisors (25994731).

102845561 is a wasteful number, since it uses less digits than its factorization.

102845561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161480 (or 161473 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 102845561 is about 10141.2800474102. The cubic root of 102845561 is about 468.5204127015.

The spelling of 102845561 in words is "one hundred two million, eight hundred forty-five thousand, five hundred sixty-one".