102090239 has 2 divisors, whose sum is σ = 102090240. Its totient is φ = 102090238.

The previous prime is 102090229. The next prime is 102090257. The reversal of 102090239 is 932090201.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102090239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102090229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51045119 + 51045120.

It is an arithmetic number, because the mean of its divisors is an integer number (51045120).

Almost surely, 2^102090239 is an apocalyptic number.

102090239 is a deficient number, since it is larger than the sum of its proper divisors (1).

102090239 is an equidigital number, since it uses as much as digits as its factorization.

102090239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 102090239 is about 10103.9714469114. The cubic root of 102090239 is about 467.3706185859.

The spelling of 102090239 in words is "one hundred two million, ninety thousand, two hundred thirty-nine".