408877561 has 2 divisors, whose sum is σ = 408877562. Its totient is φ = 408877560.

The previous prime is 408877559. The next prime is 408877589. The reversal of 408877561 is 165778804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393784336 + 15093225 = 19844^2 + 3885^2 .

It is a cyclic number.

It is not a de Polignac number, because 408877561 - 2¹ = 408877559 is a prime.

Together with 408877559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (408877531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204438780 + 204438781.

It is an arithmetic number, because the mean of its divisors is an integer number (204438781).

Almost surely, 2^408877561 is an apocalyptic number.

It is an amenable number.

408877561 is a deficient number, since it is larger than the sum of its proper divisors (1).

408877561 is an equidigital number, since it uses as much as digits as its factorization.

408877561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 376320, while the sum is 46.

The square root of 408877561 is about 20220.7210801198. The cubic root of 408877561 is about 742.2173334055.

It can be divided in two parts, 408 and 877561, that added together give a square (877969 = 937²).

The spelling of 408877561 in words is "four hundred eight million, eight hundred seventy-seven thousand, five hundred sixty-one".