68442791 has 2 divisors, whose sum is σ = 68442792. Its totient is φ = 68442790.

The previous prime is 68442767. The next prime is 68442809. The reversal of 68442791 is 19724486.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68442791 - 2⁶ = 68442727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68442721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34221395 + 34221396.

It is an arithmetic number, because the mean of its divisors is an integer number (34221396).

Almost surely, 2^68442791 is an apocalyptic number.

68442791 is a deficient number, since it is larger than the sum of its proper divisors (1).

68442791 is an equidigital number, since it uses as much as digits as its factorization.

68442791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The square root of 68442791 is about 8273.0158346277. The cubic root of 68442791 is about 409.0495353908.

The spelling of 68442791 in words is "sixty-eight million, four hundred forty-two thousand, seven hundred ninety-one".