102521449 has 2 divisors, whose sum is σ = 102521450. Its totient is φ = 102521448.

The previous prime is 102521431. The next prime is 102521453. The reversal of 102521449 is 944125201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67947049 + 34574400 = 8243^2 + 5880^2 .

It is an emirp because it is prime and its reverse (944125201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102521449 - 2¹⁵ = 102488681 is a prime.

It is not a weakly prime, because it can be changed into another prime (102521459) 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, 51260724 + 51260725.

It is an arithmetic number, because the mean of its divisors is an integer number (51260725).

Almost surely, 2^102521449 is an apocalyptic number.

It is an amenable number.

102521449 is a deficient number, since it is larger than the sum of its proper divisors (1).

102521449 is an equidigital number, since it uses as much as digits as its factorization.

102521449 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 102521449 is about 10125.2876008536. The cubic root of 102521449 is about 468.0277228689.

The spelling of 102521449 in words is "one hundred two million, five hundred twenty-one thousand, four hundred forty-nine".