102905639 has 2 divisors, whose sum is σ = 102905640. Its totient is φ = 102905638.

The previous prime is 102905603. The next prime is 102905689. The reversal of 102905639 is 936509201.

It is a weak prime.

It is an emirp because it is prime and its reverse (936509201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102905639 - 2¹² = 102901543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102905599 and 102905608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102905689) 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, 51452819 + 51452820.

It is an arithmetic number, because the mean of its divisors is an integer number (51452820).

Almost surely, 2^102905639 is an apocalyptic number.

102905639 is a deficient number, since it is larger than the sum of its proper divisors (1).

102905639 is an equidigital number, since it uses as much as digits as its factorization.

102905639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 102905639 is about 10144.2416670740. The cubic root of 102905639 is about 468.6116248386.

The spelling of 102905639 in words is "one hundred two million, nine hundred five thousand, six hundred thirty-nine".