67311989 has 2 divisors, whose sum is σ = 67311990. Its totient is φ = 67311988.

The previous prime is 67311983. The next prime is 67311997. The reversal of 67311989 is 98911376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42640900 + 24671089 = 6530^2 + 4967^2 .

It is a cyclic number.

It is not a de Polignac number, because 67311989 - 2⁸ = 67311733 is a prime.

It is a super-2 number, since 2×67311989² = 9061807726272242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67311983) 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, 33655994 + 33655995.

It is an arithmetic number, because the mean of its divisors is an integer number (33655995).

Almost surely, 2^67311989 is an apocalyptic number.

It is an amenable number.

67311989 is a deficient number, since it is larger than the sum of its proper divisors (1).

67311989 is an equidigital number, since it uses as much as digits as its factorization.

67311989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 44.

The square root of 67311989 is about 8204.3883988997. The cubic root of 67311989 is about 406.7842610594.

The spelling of 67311989 in words is "sixty-seven million, three hundred eleven thousand, nine hundred eighty-nine".