67568981 has 2 divisors, whose sum is σ = 67568982. Its totient is φ = 67568980.

The previous prime is 67568971. The next prime is 67568989. The reversal of 67568981 is 18986576.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57896881 + 9672100 = 7609^2 + 3110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67568981 is a prime.

It is a super-2 number, since 2×67568981² = 9131134386756722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67568989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33784490 + 33784491.

It is an arithmetic number, because the mean of its divisors is an integer number (33784491).

Almost surely, 2^67568981 is an apocalyptic number.

It is an amenable number.

67568981 is a deficient number, since it is larger than the sum of its proper divisors (1).

67568981 is an equidigital number, since it uses as much as digits as its factorization.

67568981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 50.

The square root of 67568981 is about 8220.0353405566. The cubic root of 67568981 is about 407.3012939662.

The spelling of 67568981 in words is "sixty-seven million, five hundred sixty-eight thousand, nine hundred eighty-one".