68531389 has 2 divisors, whose sum is σ = 68531390. Its totient is φ = 68531388.

The previous prime is 68531383. The next prime is 68531399. The reversal of 68531389 is 98313586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56400100 + 12131289 = 7510^2 + 3483^2 .

It is a cyclic number.

It is not a de Polignac number, because 68531389 - 2¹¹ = 68529341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68531383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34265694 + 34265695.

It is an arithmetic number, because the mean of its divisors is an integer number (34265695).

Almost surely, 2^68531389 is an apocalyptic number.

It is an amenable number.

68531389 is a deficient number, since it is larger than the sum of its proper divisors (1).

68531389 is an equidigital number, since it uses as much as digits as its factorization.

68531389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 43.

The square root of 68531389 is about 8278.3687402773. The cubic root of 68531389 is about 409.2259617837.

The spelling of 68531389 in words is "sixty-eight million, five hundred thirty-one thousand, three hundred eighty-nine".