102081139 has 2 divisors, whose sum is σ = 102081140. Its totient is φ = 102081138.

The previous prime is 102081079. The next prime is 102081157. The reversal of 102081139 is 931180201.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102081139 is a prime.

It is not a weakly prime, because it can be changed into another prime (102081169) 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, 51040569 + 51040570.

It is an arithmetic number, because the mean of its divisors is an integer number (51040570).

Almost surely, 2^102081139 is an apocalyptic number.

102081139 is a deficient number, since it is larger than the sum of its proper divisors (1).

102081139 is an equidigital number, since it uses as much as digits as its factorization.

102081139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 102081139 is about 10103.5211188971. The cubic root of 102081139 is about 467.3567315286.

The spelling of 102081139 in words is "one hundred two million, eighty-one thousand, one hundred thirty-nine".