556621231 has 2 divisors, whose sum is σ = 556621232. Its totient is φ = 556621230.

The previous prime is 556621199. The next prime is 556621297. The reversal of 556621231 is 132126655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 556621231 - 2⁵ = 556621199 is a prime.

It is a super-2 number, since 2×556621231² = 619654389599910722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 556621193 and 556621202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556121231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278310615 + 278310616.

It is an arithmetic number, because the mean of its divisors is an integer number (278310616).

Almost surely, 2^556621231 is an apocalyptic number.

556621231 is a deficient number, since it is larger than the sum of its proper divisors (1).

556621231 is an equidigital number, since it uses as much as digits as its factorization.

556621231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 31.

The square root of 556621231 is about 23592.8215989525. The cubic root of 556621231 is about 822.5959920362.

Adding to 556621231 its reverse (132126655), we get a palindrome (688747886).

The spelling of 556621231 in words is "five hundred fifty-six million, six hundred twenty-one thousand, two hundred thirty-one".