555645989 has 2 divisors, whose sum is σ = 555645990. Its totient is φ = 555645988.

The previous prime is 555645977. The next prime is 555646019. The reversal of 555645989 is 989546555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 304677025 + 250968964 = 17455^2 + 15842^2 .

It is a cyclic number.

It is not a de Polignac number, because 555645989 - 2⁸ = 555645733 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (555645919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277822994 + 277822995.

It is an arithmetic number, because the mean of its divisors is an integer number (277822995).

Almost surely, 2^555645989 is an apocalyptic number.

It is an amenable number.

555645989 is a deficient number, since it is larger than the sum of its proper divisors (1).

555645989 is an equidigital number, since it uses as much as digits as its factorization.

555645989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720000, while the sum is 56.

The square root of 555645989 is about 23572.1443445436. The cubic root of 555645989 is about 822.1152946339.

The spelling of 555645989 in words is "five hundred fifty-five million, six hundred forty-five thousand, nine hundred eighty-nine".