557129981 has 2 divisors, whose sum is σ = 557129982. Its totient is φ = 557129980.

The previous prime is 557129977. The next prime is 557130083. The reversal of 557129981 is 189921755.

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., 555544900 + 1585081 = 23570^2 + 1259^2 .

It is a cyclic number.

It is not a de Polignac number, because 557129981 - 2² = 557129977 is a prime.

It is a super-2 number, since 2×557129981² = 620787631458120722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (557129081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278564990 + 278564991.

It is an arithmetic number, because the mean of its divisors is an integer number (278564991).

Almost surely, 2^557129981 is an apocalyptic number.

It is an amenable number.

557129981 is a deficient number, since it is larger than the sum of its proper divisors (1).

557129981 is an equidigital number, since it uses as much as digits as its factorization.

557129981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 47.

The square root of 557129981 is about 23603.6010176414. The cubic root of 557129981 is about 822.8465324104.

The spelling of 557129981 in words is "five hundred fifty-seven million, one hundred twenty-nine thousand, nine hundred eighty-one".