68535631 has 4 divisors (see below), whose sum is σ = 68946192. Its totient is φ = 68125072.

The previous prime is 68535563. The next prime is 68535647. The reversal of 68535631 is 13653586.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68535631 - 2⁹ = 68535119 is a prime.

It is a super-2 number, since 2×68535631² = 9394265433136322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68535031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205030 + ... + 205363.

It is an arithmetic number, because the mean of its divisors is an integer number (17236548).

Almost surely, 2^68535631 is an apocalyptic number.

68535631 is a deficient number, since it is larger than the sum of its proper divisors (410561).

68535631 is a wasteful number, since it uses less digits than its factorization.

68535631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410560.

The product of its digits is 64800, while the sum is 37.

The square root of 68535631 is about 8278.6249462094. The cubic root of 68535631 is about 409.2344051201.

The spelling of 68535631 in words is "sixty-eight million, five hundred thirty-five thousand, six hundred thirty-one".