5557781 has 2 divisors, whose sum is σ = 5557782. Its totient is φ = 5557780.

The previous prime is 5557757. The next prime is 5557787. The reversal of 5557781 is 1877555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5428900 + 128881 = 2330^2 + 359^2 .

It is a cyclic number.

It is not a de Polignac number, because 5557781 - 2¹⁰ = 5556757 is a prime.

It is a super-2 number, since 2×5557781² = 61777859287922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5557787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2778890 + 2778891.

It is an arithmetic number, because the mean of its divisors is an integer number (2778891).

Almost surely, 2^5557781 is an apocalyptic number.

It is an amenable number.

5557781 is a deficient number, since it is larger than the sum of its proper divisors (1).

5557781 is an equidigital number, since it uses as much as digits as its factorization.

5557781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49000, while the sum is 38.

The square root of 5557781 is about 2357.4946447447. The cubic root of 5557781 is about 177.1334072495.

The spelling of 5557781 in words is "five million, five hundred fifty-seven thousand, seven hundred eighty-one".