67040381 has 2 divisors, whose sum is σ = 67040382. Its totient is φ = 67040380.

The previous prime is 67040359. The next prime is 67040387. The reversal of 67040381 is 18304076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36060025 + 30980356 = 6005^2 + 5566^2 .

It is a cyclic number.

It is not a de Polignac number, because 67040381 - 2⁶ = 67040317 is a prime.

It is a super-2 number, since 2×67040381² = 8988825369250322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67040387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33520190 + 33520191.

It is an arithmetic number, because the mean of its divisors is an integer number (33520191).

Almost surely, 2^67040381 is an apocalyptic number.

It is an amenable number.

67040381 is a deficient number, since it is larger than the sum of its proper divisors (1).

67040381 is an equidigital number, since it uses as much as digits as its factorization.

67040381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 67040381 is about 8187.8190624854. The cubic root of 67040381 is about 406.2363903606.

The spelling of 67040381 in words is "sixty-seven million, forty thousand, three hundred eighty-one".