102544921 has 2 divisors, whose sum is σ = 102544922. Its totient is φ = 102544920.

The previous prime is 102544903. The next prime is 102544933. The reversal of 102544921 is 129445201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95335696 + 7209225 = 9764^2 + 2685^2 .

It is an emirp because it is prime and its reverse (129445201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102544921 - 2¹³ = 102536729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 102544921.

It is not a weakly prime, because it can be changed into another prime (102544951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51272460 + 51272461.

It is an arithmetic number, because the mean of its divisors is an integer number (51272461).

Almost surely, 2^102544921 is an apocalyptic number.

It is an amenable number.

102544921 is a deficient number, since it is larger than the sum of its proper divisors (1).

102544921 is an equidigital number, since it uses as much as digits as its factorization.

102544921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 102544921 is about 10126.4466127067. The cubic root of 102544921 is about 468.0634380243.

The spelling of 102544921 in words is "one hundred two million, five hundred forty-four thousand, nine hundred twenty-one".