102839621 has 2 divisors, whose sum is σ = 102839622. Its totient is φ = 102839620.

The previous prime is 102839599. The next prime is 102839623. The reversal of 102839621 is 126938201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95277121 + 7562500 = 9761^2 + 2750^2 .

It is a cyclic number.

It is not a de Polignac number, because 102839621 - 2¹⁸ = 102577477 is a prime.

Together with 102839623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102839623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51419810 + 51419811.

It is an arithmetic number, because the mean of its divisors is an integer number (51419811).

Almost surely, 2^102839621 is an apocalyptic number.

It is an amenable number.

102839621 is a deficient number, since it is larger than the sum of its proper divisors (1).

102839621 is an equidigital number, since it uses as much as digits as its factorization.

102839621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 102839621 is about 10140.9871807433. The cubic root of 102839621 is about 468.5113924942.

The spelling of 102839621 in words is "one hundred two million, eight hundred thirty-nine thousand, six hundred twenty-one".