41121781 has 2 divisors, whose sum is σ = 41121782. Its totient is φ = 41121780.

The previous prime is 41121733. The next prime is 41121809. The reversal of 41121781 is 18712114.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27394756 + 13727025 = 5234^2 + 3705^2 .

It is a cyclic number.

It is not a de Polignac number, because 41121781 - 2²⁵ = 7567349 is a prime.

It is a super-2 number, since 2×41121781² = 3382001745223922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41121721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20560890 + 20560891.

It is an arithmetic number, because the mean of its divisors is an integer number (20560891).

Almost surely, 2^41121781 is an apocalyptic number.

It is an amenable number.

41121781 is a deficient number, since it is larger than the sum of its proper divisors (1).

41121781 is an equidigital number, since it uses as much as digits as its factorization.

41121781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 448, while the sum is 25.

The square root of 41121781 is about 6412.6266849085. The cubic root of 41121781 is about 345.1627909186.

Adding to 41121781 its reverse (18712114), we get a palindrome (59833895).

The spelling of 41121781 in words is "forty-one million, one hundred twenty-one thousand, seven hundred eighty-one".