168992639 has 2 divisors, whose sum is σ = 168992640. Its totient is φ = 168992638.

The previous prime is 168992633. The next prime is 168992713. The reversal of 168992639 is 936299861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 168992639 - 2¹⁶ = 168927103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168992633) 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, 84496319 + 84496320.

It is an arithmetic number, because the mean of its divisors is an integer number (84496320).

Almost surely, 2^168992639 is an apocalyptic number.

168992639 is a deficient number, since it is larger than the sum of its proper divisors (1).

168992639 is an equidigital number, since it uses as much as digits as its factorization.

168992639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1259712, while the sum is 53.

The square root of 168992639 is about 12999.7168815325. The cubic root of 168992639 is about 552.8694541682.

The spelling of 168992639 in words is "one hundred sixty-eight million, nine hundred ninety-two thousand, six hundred thirty-nine".