41781391 has 2 divisors, whose sum is σ = 41781392. Its totient is φ = 41781390.

The previous prime is 41781379. The next prime is 41781407. The reversal of 41781391 is 19318714.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 41781391 - 2¹⁹ = 41257103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41781491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20890695 + 20890696.

It is an arithmetic number, because the mean of its divisors is an integer number (20890696).

Almost surely, 2^41781391 is an apocalyptic number.

41781391 is a deficient number, since it is larger than the sum of its proper divisors (1).

41781391 is an equidigital number, since it uses as much as digits as its factorization.

41781391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 34.

The square root of 41781391 is about 6463.8526437412. The cubic root of 41781391 is about 346.9985272356.

The spelling of 41781391 in words is "forty-one million, seven hundred eighty-one thousand, three hundred ninety-one".