68193581 has 2 divisors, whose sum is σ = 68193582. Its totient is φ = 68193580.

The previous prime is 68193577. The next prime is 68193589. The reversal of 68193581 is 18539186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57078025 + 11115556 = 7555^2 + 3334^2 .

It is a cyclic number.

It is not a de Polignac number, because 68193581 - 2² = 68193577 is a prime.

It is a super-2 number, since 2×68193581² = 9300728979207122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68193589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34096790 + 34096791.

It is an arithmetic number, because the mean of its divisors is an integer number (34096791).

Almost surely, 2^68193581 is an apocalyptic number.

It is an amenable number.

68193581 is a deficient number, since it is larger than the sum of its proper divisors (1).

68193581 is an equidigital number, since it uses as much as digits as its factorization.

68193581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 41.

The square root of 68193581 is about 8257.9404817424. The cubic root of 68193581 is about 408.5524622916.

The spelling of 68193581 in words is "sixty-eight million, one hundred ninety-three thousand, five hundred eighty-one".