102942139 has 2 divisors, whose sum is σ = 102942140. Its totient is φ = 102942138.

The previous prime is 102942137. The next prime is 102942143. The reversal of 102942139 is 931249201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102942139 - 2¹ = 102942137 is a prime.

Together with 102942137, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 102942139.

It is not a weakly prime, because it can be changed into another prime (102942137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51471069 + 51471070.

It is an arithmetic number, because the mean of its divisors is an integer number (51471070).

Almost surely, 2^102942139 is an apocalyptic number.

102942139 is a deficient number, since it is larger than the sum of its proper divisors (1).

102942139 is an equidigital number, since it uses as much as digits as its factorization.

102942139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 102942139 is about 10146.0405577742. The cubic root of 102942139 is about 468.6670228472.

The spelling of 102942139 in words is "one hundred two million, nine hundred forty-two thousand, one hundred thirty-nine".