688142850931 has 2 divisors, whose sum is σ = 688142850932. Its totient is φ = 688142850930.

The previous prime is 688142850907. The next prime is 688142850949. The reversal of 688142850931 is 139058241886.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 688142850931 - 2¹⁹ = 688142326643 is a prime.

It is a super-2 number, since 2×688142850931² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (688142850971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344071425465 + 344071425466.

It is an arithmetic number, because the mean of its divisors is an integer number (344071425466).

Almost surely, 2^688142850931 is an apocalyptic number.

688142850931 is a deficient number, since it is larger than the sum of its proper divisors (1).

688142850931 is an equidigital number, since it uses as much as digits as its factorization.

688142850931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3317760, while the sum is 55.

The spelling of 688142850931 in words is "six hundred eighty-eight billion, one hundred forty-two million, eight hundred fifty thousand, nine hundred thirty-one".