67312813 has 2 divisors, whose sum is σ = 67312814. Its totient is φ = 67312812.

The previous prime is 67312807. The next prime is 67312853. The reversal of 67312813 is 31821376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64208169 + 3104644 = 8013^2 + 1762^2 .

It is a cyclic number.

It is not a de Polignac number, because 67312813 - 2²⁵ = 33758381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67312853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33656406 + 33656407.

It is an arithmetic number, because the mean of its divisors is an integer number (33656407).

Almost surely, 2^67312813 is an apocalyptic number.

It is an amenable number.

67312813 is a deficient number, since it is larger than the sum of its proper divisors (1).

67312813 is an equidigital number, since it uses as much as digits as its factorization.

67312813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 31.

The square root of 67312813 is about 8204.4386157738. The cubic root of 67312813 is about 406.7859209364.

The spelling of 67312813 in words is "sixty-seven million, three hundred twelve thousand, eight hundred thirteen".