71667389 has 2 divisors, whose sum is σ = 71667390. Its totient is φ = 71667388.

The previous prime is 71667377. The next prime is 71667413. The reversal of 71667389 is 98376617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65205625 + 6461764 = 8075^2 + 2542^2 .

It is an emirp because it is prime and its reverse (98376617) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71667389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71667989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35833694 + 35833695.

It is an arithmetic number, because the mean of its divisors is an integer number (35833695).

Almost surely, 2^71667389 is an apocalyptic number.

It is an amenable number.

71667389 is a deficient number, since it is larger than the sum of its proper divisors (1).

71667389 is an equidigital number, since it uses as much as digits as its factorization.

71667389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 47.

The square root of 71667389 is about 8465.6593954635. The cubic root of 71667389 is about 415.3751656541.

The spelling of 71667389 in words is "seventy-one million, six hundred sixty-seven thousand, three hundred eighty-nine".