68535491 has 2 divisors, whose sum is σ = 68535492. Its totient is φ = 68535490.

The previous prime is 68535463. The next prime is 68535499. The reversal of 68535491 is 19453586.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68535491 - 2¹⁰ = 68534467 is a prime.

It is a super-2 number, since 2×68535491² = 9394227053222162, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68535499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34267745 + 34267746.

It is an arithmetic number, because the mean of its divisors is an integer number (34267746).

Almost surely, 2^68535491 is an apocalyptic number.

68535491 is a deficient number, since it is larger than the sum of its proper divisors (1).

68535491 is an equidigital number, since it uses as much as digits as its factorization.

68535491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 41.

The square root of 68535491 is about 8278.6164906946. The cubic root of 68535491 is about 409.2341264677.

The spelling of 68535491 in words is "sixty-eight million, five hundred thirty-five thousand, four hundred ninety-one".