41397781 has 2 divisors, whose sum is σ = 41397782. Its totient is φ = 41397780.

The previous prime is 41397767. The next prime is 41397793. The reversal of 41397781 is 18779314.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33246756 + 8151025 = 5766^2 + 2855^2 .

It is a cyclic number.

It is not a de Polignac number, because 41397781 - 2¹¹ = 41395733 is a prime.

It is a super-2 number, since 2×41397781² = 3427552543447922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41397281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20698890 + 20698891.

It is an arithmetic number, because the mean of its divisors is an integer number (20698891).

Almost surely, 2^41397781 is an apocalyptic number.

It is an amenable number.

41397781 is a deficient number, since it is larger than the sum of its proper divisors (1).

41397781 is an equidigital number, since it uses as much as digits as its factorization.

41397781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 40.

The square root of 41397781 is about 6434.1107388667. The cubic root of 41397781 is about 345.9332876158.

The spelling of 41397781 in words is "forty-one million, three hundred ninety-seven thousand, seven hundred eighty-one".