556021639 has 2 divisors, whose sum is σ = 556021640. Its totient is φ = 556021638.

The previous prime is 556021603. The next prime is 556021663. The reversal of 556021639 is 936120655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 556021639 - 2⁷ = 556021511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 556021598 and 556021607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556021699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278010819 + 278010820.

It is an arithmetic number, because the mean of its divisors is an integer number (278010820).

Almost surely, 2^556021639 is an apocalyptic number.

556021639 is a deficient number, since it is larger than the sum of its proper divisors (1).

556021639 is an equidigital number, since it uses as much as digits as its factorization.

556021639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 556021639 is about 23580.1110896450. Note that the first 3 decimals coincide. The cubic root of 556021639 is about 822.3005193078.

The spelling of 556021639 in words is "five hundred fifty-six million, twenty-one thousand, six hundred thirty-nine".