556672981 has 2 divisors, whose sum is σ = 556672982. Its totient is φ = 556672980.

The previous prime is 556672943. The next prime is 556672993. The reversal of 556672981 is 189276655.

556672981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 409414756 + 147258225 = 20234^2 + 12135^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556672981 is a prime.

It is a super-2 number, since 2×556672981² = 619769615550852722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556672481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278336490 + 278336491.

It is an arithmetic number, because the mean of its divisors is an integer number (278336491).

Almost surely, 2^556672981 is an apocalyptic number.

It is an amenable number.

556672981 is a deficient number, since it is larger than the sum of its proper divisors (1).

556672981 is an equidigital number, since it uses as much as digits as its factorization.

556672981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 49.

The square root of 556672981 is about 23593.9183053600. The cubic root of 556672981 is about 822.6214839513.

The spelling of 556672981 in words is "five hundred fifty-six million, six hundred seventy-two thousand, nine hundred eighty-one".