168242731 has 2 divisors, whose sum is σ = 168242732. Its totient is φ = 168242730.

The previous prime is 168242719. The next prime is 168242741. The reversal of 168242731 is 137242861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 168242731 - 2¹⁵ = 168209963 is a prime.

It is a super-2 number, since 2×168242731² = 56611233068676722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (168242741) 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, 84121365 + 84121366.

It is an arithmetic number, because the mean of its divisors is an integer number (84121366).

Almost surely, 2^168242731 is an apocalyptic number.

168242731 is a deficient number, since it is larger than the sum of its proper divisors (1).

168242731 is an equidigital number, since it uses as much as digits as its factorization.

168242731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 34.

The square root of 168242731 is about 12970.8415686878. The cubic root of 168242731 is about 552.0504520066.

The spelling of 168242731 in words is "one hundred sixty-eight million, two hundred forty-two thousand, seven hundred thirty-one".