68213881 has 2 divisors, whose sum is σ = 68213882. Its totient is φ = 68213880.

The previous prime is 68213869. The next prime is 68213909. The reversal of 68213881 is 18831286.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42458256 + 25755625 = 6516^2 + 5075^2 .

It is a cyclic number.

It is not a de Polignac number, because 68213881 - 2¹⁷ = 68082809 is a prime.

It is a super-2 number, since 2×68213881² = 9306267122164322, 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 68213881.

It is not a weakly prime, because it can be changed into another prime (68213801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34106940 + 34106941.

It is an arithmetic number, because the mean of its divisors is an integer number (34106941).

Almost surely, 2^68213881 is an apocalyptic number.

It is an amenable number.

68213881 is a deficient number, since it is larger than the sum of its proper divisors (1).

68213881 is an equidigital number, since it uses as much as digits as its factorization.

68213881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 37.

The square root of 68213881 is about 8259.1695103079. The cubic root of 68213881 is about 408.5929978378.

The spelling of 68213881 in words is "sixty-eight million, two hundred thirteen thousand, eight hundred eighty-one".