68426381 has 2 divisors, whose sum is σ = 68426382. Its totient is φ = 68426380.

The previous prime is 68426333. The next prime is 68426383. The reversal of 68426381 is 18362486.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64561225 + 3865156 = 8035^2 + 1966^2 .

It is a cyclic number.

It is not a de Polignac number, because 68426381 - 2⁶ = 68426317 is a prime.

It is a super-2 number, since 2×68426381² = 9364339233514322, which contains 22 as substring.

Together with 68426383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68426383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34213190 + 34213191.

It is an arithmetic number, because the mean of its divisors is an integer number (34213191).

Almost surely, 2^68426381 is an apocalyptic number.

It is an amenable number.

68426381 is a deficient number, since it is larger than the sum of its proper divisors (1).

68426381 is an equidigital number, since it uses as much as digits as its factorization.

68426381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 38.

The square root of 68426381 is about 8272.0239965803. The cubic root of 68426381 is about 409.0168412272.

The spelling of 68426381 in words is "sixty-eight million, four hundred twenty-six thousand, three hundred eighty-one".