102844561 has 2 divisors, whose sum is σ = 102844562. Its totient is φ = 102844560.

The previous prime is 102844559. The next prime is 102844579. The reversal of 102844561 is 165448201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101203600 + 1640961 = 10060^2 + 1281^2 .

It is a cyclic number.

It is not a de Polignac number, because 102844561 - 2¹ = 102844559 is a prime.

Together with 102844559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (102844501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51422280 + 51422281.

It is an arithmetic number, because the mean of its divisors is an integer number (51422281).

Almost surely, 2^102844561 is an apocalyptic number.

It is an amenable number.

102844561 is a deficient number, since it is larger than the sum of its proper divisors (1).

102844561 is an equidigital number, since it uses as much as digits as its factorization.

102844561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 102844561 is about 10141.2307438496. The cubic root of 102844561 is about 468.5188941724.

The spelling of 102844561 in words is "one hundred two million, eight hundred forty-four thousand, five hundred sixty-one".