68891489 has 2 divisors, whose sum is σ = 68891490. Its totient is φ = 68891488.

The previous prime is 68891453. The next prime is 68891503. The reversal of 68891489 is 98419886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54390625 + 14500864 = 7375^2 + 3808^2 .

It is a cyclic number.

It is not a de Polignac number, because 68891489 - 2¹² = 68887393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 68891489.

It is not a weakly prime, because it can be changed into another prime (68891419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34445744 + 34445745.

It is an arithmetic number, because the mean of its divisors is an integer number (34445745).

Almost surely, 2^68891489 is an apocalyptic number.

It is an amenable number.

68891489 is a deficient number, since it is larger than the sum of its proper divisors (1).

68891489 is an equidigital number, since it uses as much as digits as its factorization.

68891489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 53.

The square root of 68891489 is about 8300.0896983105. The cubic root of 68891489 is about 409.9414729069.

The spelling of 68891489 in words is "sixty-eight million, eight hundred ninety-one thousand, four hundred eighty-nine".