688020131 has 2 divisors, whose sum is σ = 688020132. Its totient is φ = 688020130.

The previous prime is 688020101. The next prime is 688020163. The reversal of 688020131 is 131020886.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-688020131 is a prime.

It is a super-2 number, since 2×688020131² = 946743401322514322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 688020094 and 688020103.

It is not a weakly prime, because it can be changed into another prime (688020101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344010065 + 344010066.

It is an arithmetic number, because the mean of its divisors is an integer number (344010066).

Almost surely, 2^688020131 is an apocalyptic number.

688020131 is a deficient number, since it is larger than the sum of its proper divisors (1).

688020131 is an equidigital number, since it uses as much as digits as its factorization.

688020131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 688020131 is about 26230.1378379909. The cubic root of 688020131 is about 882.8096027081.

The spelling of 688020131 in words is "six hundred eighty-eight million, twenty thousand, one hundred thirty-one".