168542239 has 2 divisors, whose sum is σ = 168542240. Its totient is φ = 168542238.

The previous prime is 168542203. The next prime is 168542263. The reversal of 168542239 is 932245861.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168542239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168542039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84271119 + 84271120.

It is an arithmetic number, because the mean of its divisors is an integer number (84271120).

Almost surely, 2^168542239 is an apocalyptic number.

168542239 is a deficient number, since it is larger than the sum of its proper divisors (1).

168542239 is an equidigital number, since it uses as much as digits as its factorization.

168542239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 40.

The square root of 168542239 is about 12982.3818692873. The cubic root of 168542239 is about 552.3778470489.

The spelling of 168542239 in words is "one hundred sixty-eight million, five hundred forty-two thousand, two hundred thirty-nine".