556321697 has 2 divisors, whose sum is σ = 556321698. Its totient is φ = 556321696.

The previous prime is 556321687. The next prime is 556321699. The reversal of 556321697 is 796123655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 450458176 + 105863521 = 21224^2 + 10289^2 .

It is a cyclic number.

It is not a de Polignac number, because 556321697 - 2⁴ = 556321681 is a prime.

Together with 556321699, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_29159594 and since 556321697 and 29159594 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (556321699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278160848 + 278160849.

It is an arithmetic number, because the mean of its divisors is an integer number (278160849).

Almost surely, 2^556321697 is an apocalyptic number.

556321697 is the 12608-th centered heptagonal number.

It is an amenable number.

556321697 is a deficient number, since it is larger than the sum of its proper divisors (1).

556321697 is an equidigital number, since it uses as much as digits as its factorization.

556321697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 340200, while the sum is 44.

The square root of 556321697 is about 23586.4727545261. The cubic root of 556321697 is about 822.4484113207.

The spelling of 556321697 in words is "five hundred fifty-six million, three hundred twenty-one thousand, six hundred ninety-seven".