408141781 has 2 divisors, whose sum is σ = 408141782. Its totient is φ = 408141780.

The previous prime is 408141779. The next prime is 408141791. The reversal of 408141781 is 187141804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 385768881 + 22372900 = 19641^2 + 4730^2 .

It is a cyclic number.

It is not a de Polignac number, because 408141781 - 2¹ = 408141779 is a prime.

It is a super-2 number, since 2×408141781² = 333159426795703922, which contains 22 as substring.

Together with 408141779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408141791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204070890 + 204070891.

It is an arithmetic number, because the mean of its divisors is an integer number (204070891).

Almost surely, 2^408141781 is an apocalyptic number.

It is an amenable number.

408141781 is a deficient number, since it is larger than the sum of its proper divisors (1).

408141781 is an equidigital number, since it uses as much as digits as its factorization.

408141781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 408141781 is about 20202.5191745980. The cubic root of 408141781 is about 741.7718564658.

The spelling of 408141781 in words is "four hundred eight million, one hundred forty-one thousand, seven hundred eighty-one".