688513741 has 2 divisors, whose sum is σ = 688513742. Its totient is φ = 688513740.

The previous prime is 688513729. The next prime is 688513769. The reversal of 688513741 is 147315886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 686702025 + 1811716 = 26205^2 + 1346^2 .

It is a cyclic number.

It is not a de Polignac number, because 688513741 - 2⁹ = 688513229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688513781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344256870 + 344256871.

It is an arithmetic number, because the mean of its divisors is an integer number (344256871).

Almost surely, 2^688513741 is an apocalyptic number.

It is an amenable number.

688513741 is a deficient number, since it is larger than the sum of its proper divisors (1).

688513741 is an equidigital number, since it uses as much as digits as its factorization.

688513741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 43.

The square root of 688513741 is about 26239.5453657261. The cubic root of 688513741 is about 883.0206718610.

The spelling of 688513741 in words is "six hundred eighty-eight million, five hundred thirteen thousand, seven hundred forty-one".