688711511 has 2 divisors, whose sum is σ = 688711512. Its totient is φ = 688711510.

The previous prime is 688711477. The next prime is 688711523. The reversal of 688711511 is 115117886.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 688711511 - 2⁶ = 688711447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688711561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344355755 + 344355756.

It is an arithmetic number, because the mean of its divisors is an integer number (344355756).

Almost surely, 2^688711511 is an apocalyptic number.

688711511 is a deficient number, since it is larger than the sum of its proper divisors (1).

688711511 is an equidigital number, since it uses as much as digits as its factorization.

688711511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 38.

The square root of 688711511 is about 26243.3136436693. The cubic root of 688711511 is about 883.1052106145.

The spelling of 688711511 in words is "six hundred eighty-eight million, seven hundred eleven thousand, five hundred eleven".