555556081 has 2 divisors, whose sum is σ = 555556082. Its totient is φ = 555556080.

The previous prime is 555556033. The next prime is 555556139. The reversal of 555556081 is 180655555.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 475632481 + 79923600 = 21809^2 + 8940^2 .

It is a cyclic number.

It is not a de Polignac number, because 555556081 - 2¹⁷ = 555425009 is a prime.

It is a super-2 number, since 2×555556081² = 617285118272157122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (555556021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277778040 + 277778041.

It is an arithmetic number, because the mean of its divisors is an integer number (277778041).

Almost surely, 2^555556081 is an apocalyptic number.

It is an amenable number.

555556081 is a deficient number, since it is larger than the sum of its proper divisors (1).

555556081 is an equidigital number, since it uses as much as digits as its factorization.

555556081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150000, while the sum is 40.

The square root of 555556081 is about 23570.2371859088. The cubic root of 555556081 is about 822.0709506149.

The spelling of 555556081 in words is "five hundred fifty-five million, five hundred fifty-six thousand, eighty-one".