688820201 has 2 divisors, whose sum is σ = 688820202. Its totient is φ = 688820200.

The previous prime is 688820147. The next prime is 688820239. The reversal of 688820201 is 102028886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 599025625 + 89794576 = 24475^2 + 9476^2 .

It is a cyclic number.

It is not a de Polignac number, because 688820201 - 2⁶ = 688820137 is a prime.

It is not a weakly prime, because it can be changed into another prime (688820291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344410100 + 344410101.

It is an arithmetic number, because the mean of its divisors is an integer number (344410101).

Almost surely, 2^688820201 is an apocalyptic number.

It is an amenable number.

688820201 is a deficient number, since it is larger than the sum of its proper divisors (1).

688820201 is an equidigital number, since it uses as much as digits as its factorization.

688820201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 688820201 is about 26245.3843751620. The cubic root of 688820201 is about 883.1516643448.

The spelling of 688820201 in words is "six hundred eighty-eight million, eight hundred twenty thousand, two hundred one".