557639549 has 4 divisors (see below), whose sum is σ = 557691036. Its totient is φ = 557588064.

The previous prime is 557639539. The next prime is 557639561. The reversal of 557639549 is 945936755.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 244703449 + 312936100 = 15643^2 + 17690^2 .

It is a cyclic number.

It is not a de Polignac number, because 557639549 - 2¹² = 557635453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 557639549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (557639539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2504 + ... + 33489.

It is an arithmetic number, because the mean of its divisors is an integer number (139422759).

Almost surely, 2^557639549 is an apocalyptic number.

It is an amenable number.

557639549 is a deficient number, since it is larger than the sum of its proper divisors (51487).

557639549 is a wasteful number, since it uses less digits than its factorization.

557639549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51486.

The product of its digits is 5103000, while the sum is 53.

The square root of 557639549 is about 23614.3928357263. The cubic root of 557639549 is about 823.0973227749.

The spelling of 557639549 in words is "five hundred fifty-seven million, six hundred thirty-nine thousand, five hundred forty-nine".