557621887 has 2 divisors, whose sum is σ = 557621888. Its totient is φ = 557621886.

The previous prime is 557621849. The next prime is 557621917. The reversal of 557621887 is 788126755.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-557621887 is a prime.

It is a super-3 number, since 3×557621887³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 557621887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (557621287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278810943 + 278810944.

It is an arithmetic number, because the mean of its divisors is an integer number (278810944).

Almost surely, 2^557621887 is an apocalyptic number.

557621887 is a deficient number, since it is larger than the sum of its proper divisors (1).

557621887 is an equidigital number, since it uses as much as digits as its factorization.

557621887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 940800, while the sum is 49.

The square root of 557621887 is about 23614.0188659195. The cubic root of 557621887 is about 823.0886327538.

The spelling of 557621887 in words is "five hundred fifty-seven million, six hundred twenty-one thousand, eight hundred eighty-seven".