688361573 has 2 divisors, whose sum is σ = 688361574. Its totient is φ = 688361572.

The previous prime is 688361519. The next prime is 688361581. The reversal of 688361573 is 375163886.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 683195044 + 5166529 = 26138^2 + 2273^2 .

It is a cyclic number.

It is not a de Polignac number, because 688361573 - 2¹² = 688357477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688361593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344180786 + 344180787.

It is an arithmetic number, because the mean of its divisors is an integer number (344180787).

Almost surely, 2^688361573 is an apocalyptic number.

It is an amenable number.

688361573 is a deficient number, since it is larger than the sum of its proper divisors (1).

688361573 is an equidigital number, since it uses as much as digits as its factorization.

688361573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 47.

The square root of 688361573 is about 26236.6456125778. The cubic root of 688361573 is about 882.9556151156.

The spelling of 688361573 in words is "six hundred eighty-eight million, three hundred sixty-one thousand, five hundred seventy-three".