68711491 has 2 divisors, whose sum is σ = 68711492. Its totient is φ = 68711490.

The previous prime is 68711473. The next prime is 68711497. The reversal of 68711491 is 19411786.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68711491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68711491.

It is not a weakly prime, because it can be changed into another prime (68711497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34355745 + 34355746.

It is an arithmetic number, because the mean of its divisors is an integer number (34355746).

Almost surely, 2^68711491 is an apocalyptic number.

68711491 is a deficient number, since it is larger than the sum of its proper divisors (1).

68711491 is an equidigital number, since it uses as much as digits as its factorization.

68711491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 37.

The square root of 68711491 is about 8289.2394705425. The cubic root of 68711491 is about 409.5841331534.

The spelling of 68711491 in words is "sixty-eight million, seven hundred eleven thousand, four hundred ninety-one".