68194081 has 4 divisors (see below), whose sum is σ = 68314500. Its totient is φ = 68073664.

The previous prime is 68194073. The next prime is 68194117. The reversal of 68194081 is 18049186.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18049186 = 2 ⋅9024593.

It can be written as a sum of positive squares in 2 ways, for example, as 16483600 + 51710481 = 4060^2 + 7191^2 .

It is a cyclic number.

It is not a de Polignac number, because 68194081 - 2³ = 68194073 is a prime.

It is a super-2 number, since 2×68194081² = 9300865366869122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68194081.

It is not an unprimeable number, because it can be changed into a prime (68194681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59356 + ... + 60493.

It is an arithmetic number, because the mean of its divisors is an integer number (17078625).

Almost surely, 2^68194081 is an apocalyptic number.

It is an amenable number.

68194081 is a deficient number, since it is larger than the sum of its proper divisors (120419).

68194081 is a wasteful number, since it uses less digits than its factorization.

68194081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120418.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 68194081 is about 8257.9707555791. The cubic root of 68194081 is about 408.5534608007.

The spelling of 68194081 in words is "sixty-eight million, one hundred ninety-four thousand, eighty-one".