68616491 has 2 divisors, whose sum is σ = 68616492. Its totient is φ = 68616490.

The previous prime is 68616487. The next prime is 68616511. The reversal of 68616491 is 19461686.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68616491 - 2² = 68616487 is a prime.

It is not a weakly prime, because it can be changed into another prime (68616421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34308245 + 34308246.

It is an arithmetic number, because the mean of its divisors is an integer number (34308246).

Almost surely, 2^68616491 is an apocalyptic number.

68616491 is a deficient number, since it is larger than the sum of its proper divisors (1).

68616491 is an equidigital number, since it uses as much as digits as its factorization.

68616491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 41.

The square root of 68616491 is about 8283.5071678607. The cubic root of 68616491 is about 409.3952834267.

The spelling of 68616491 in words is "sixty-eight million, six hundred sixteen thousand, four hundred ninety-one".