555649639 has 2 divisors, whose sum is σ = 555649640. Its totient is φ = 555649638.

The previous prime is 555649579. The next prime is 555649643. The reversal of 555649639 is 936946555.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-555649639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (555649439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277824819 + 277824820.

It is an arithmetic number, because the mean of its divisors is an integer number (277824820).

Almost surely, 2^555649639 is an apocalyptic number.

555649639 is a deficient number, since it is larger than the sum of its proper divisors (1).

555649639 is an equidigital number, since it uses as much as digits as its factorization.

555649639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4374000, while the sum is 52.

The square root of 555649639 is about 23572.2217663079. The cubic root of 555649639 is about 822.1170947695.

The spelling of 555649639 in words is "five hundred fifty-five million, six hundred forty-nine thousand, six hundred thirty-nine".