68531399 has 2 divisors, whose sum is σ = 68531400. Its totient is φ = 68531398.

The previous prime is 68531389. The next prime is 68531413. The reversal of 68531399 is 99313586.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68531399 - 2⁴ = 68531383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68531389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34265699 + 34265700.

It is an arithmetic number, because the mean of its divisors is an integer number (34265700).

Almost surely, 2^68531399 is an apocalyptic number.

68531399 is a deficient number, since it is larger than the sum of its proper divisors (1).

68531399 is an equidigital number, since it uses as much as digits as its factorization.

68531399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 44.

The square root of 68531399 is about 8278.3693442610. The cubic root of 68531399 is about 409.2259816882.

The spelling of 68531399 in words is "sixty-eight million, five hundred thirty-one thousand, three hundred ninety-nine".