68210731 has 2 divisors, whose sum is σ = 68210732. Its totient is φ = 68210730.

The previous prime is 68210719. The next prime is 68210759. The reversal of 68210731 is 13701286.

It is an a-pointer prime, because the next prime (68210759) can be obtained adding 68210731 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68210731 - 2⁵ = 68210699 is a prime.

It is a super-2 number, since 2×68210731² = 9305407647108722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68210731.

It is not a weakly prime, because it can be changed into another prime (68210231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34105365 + 34105366.

It is an arithmetic number, because the mean of its divisors is an integer number (34105366).

Almost surely, 2^68210731 is an apocalyptic number.

68210731 is a deficient number, since it is larger than the sum of its proper divisors (1).

68210731 is an equidigital number, since it uses as much as digits as its factorization.

68210731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 68210731 is about 8258.9788109669. The cubic root of 68210731 is about 408.5867083665.

The spelling of 68210731 in words is "sixty-eight million, two hundred ten thousand, seven hundred thirty-one".