597172661 has 2 divisors, whose sum is σ = 597172662. Its totient is φ = 597172660.

The previous prime is 597172649. The next prime is 597172663. The reversal of 597172661 is 166271795.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 584140561 + 13032100 = 24169^2 + 3610^2 .

It is a cyclic number.

It is not a de Polignac number, because 597172661 - 2¹⁴ = 597156277 is a prime.

It is a Sophie Germain prime.

Together with 597172663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (597172663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 298586330 + 298586331.

It is an arithmetic number, because the mean of its divisors is an integer number (298586331).

Almost surely, 2^597172661 is an apocalyptic number.

It is an amenable number.

597172661 is a deficient number, since it is larger than the sum of its proper divisors (1).

597172661 is an equidigital number, since it uses as much as digits as its factorization.

597172661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 44.

The square root of 597172661 is about 24437.1164624634. The cubic root of 597172661 is about 842.1057621844.

The spelling of 597172661 in words is "five hundred ninety-seven million, one hundred seventy-two thousand, six hundred sixty-one".