68981641 has 4 divisors (see below), whose sum is σ = 69592212. Its totient is φ = 68371072.

The previous prime is 68981629. The next prime is 68981651. The reversal of 68981641 is 14618986.

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

It can be written as a sum of positive squares in 2 ways, for example, as 31036041 + 37945600 = 5571^2 + 6160^2 .

It is a cyclic number.

It is not a de Polignac number, because 68981641 - 2⁷ = 68981513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68981621) 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 in 3 ways as a sum of consecutive naturals, for example, 305116 + ... + 305341.

It is an arithmetic number, because the mean of its divisors is an integer number (17398053).

Almost surely, 2^68981641 is an apocalyptic number.

It is an amenable number.

68981641 is a deficient number, since it is larger than the sum of its proper divisors (610571).

68981641 is a wasteful number, since it uses less digits than its factorization.

68981641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610570.

The product of its digits is 82944, while the sum is 43.

The square root of 68981641 is about 8305.5187074619. The cubic root of 68981641 is about 410.1202126184.

The spelling of 68981641 in words is "sixty-eight million, nine hundred eighty-one thousand, six hundred forty-one".