557621917 has 2 divisors, whose sum is σ = 557621918. Its totient is φ = 557621916.

The previous prime is 557621887. The next prime is 557621927. The reversal of 557621917 is 719126755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390023001 + 167598916 = 19749^2 + 12946^2 .

It is a cyclic number.

It is not a de Polignac number, because 557621917 - 2¹¹ = 557619869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (557621927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278810958 + 278810959.

It is an arithmetic number, because the mean of its divisors is an integer number (278810959).

Almost surely, 2^557621917 is an apocalyptic number.

It is an amenable number.

557621917 is a deficient number, since it is larger than the sum of its proper divisors (1).

557621917 is an equidigital number, since it uses as much as digits as its factorization.

557621917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 132300, while the sum is 43.

The square root of 557621917 is about 23614.0195011353. The cubic root of 557621917 is about 823.0886475145.

The spelling of 557621917 in words is "five hundred fifty-seven million, six hundred twenty-one thousand, nine hundred seventeen".