68931539 has 2 divisors, whose sum is σ = 68931540. Its totient is φ = 68931538.

The previous prime is 68931503. The next prime is 68931547. The reversal of 68931539 is 93513986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68931539 - 2¹⁶ = 68866003 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68931539.

It is not a weakly prime, because it can be changed into another prime (68931589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34465769 + 34465770.

It is an arithmetic number, because the mean of its divisors is an integer number (34465770).

Almost surely, 2^68931539 is an apocalyptic number.

68931539 is a deficient number, since it is larger than the sum of its proper divisors (1).

68931539 is an equidigital number, since it uses as much as digits as its factorization.

68931539 is an evil number, because the sum of its binary digits is even.

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

The square root of 68931539 is about 8302.5019722973. The cubic root of 68931539 is about 410.0208972097.

The spelling of 68931539 in words is "sixty-eight million, nine hundred thirty-one thousand, five hundred thirty-nine".