68051491 has 2 divisors, whose sum is σ = 68051492. Its totient is φ = 68051490.

The previous prime is 68051449. The next prime is 68051507. The reversal of 68051491 is 19415086.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68051491 is a prime.

It is not a weakly prime, because it can be changed into another prime (68051591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34025745 + 34025746.

It is an arithmetic number, because the mean of its divisors is an integer number (34025746).

Almost surely, 2^68051491 is an apocalyptic number.

68051491 is a deficient number, since it is larger than the sum of its proper divisors (1).

68051491 is an equidigital number, since it uses as much as digits as its factorization.

68051491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 68051491 is about 8249.3327608965. The cubic root of 68051491 is about 408.2685079747.

The spelling of 68051491 in words is "sixty-eight million, fifty-one thousand, four hundred ninety-one".