687534207391 has 2 divisors, whose sum is σ = 687534207392. Its totient is φ = 687534207390.

The previous prime is 687534207281. The next prime is 687534207419. The reversal of 687534207391 is 193702435786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687534207391 - 2³⁵ = 653174469023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687534207491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343767103695 + 343767103696.

It is an arithmetic number, because the mean of its divisors is an integer number (343767103696).

It is a 1-persistent number, because it is pandigital, but 2⋅687534207391 = 1375068414782 is not.

Almost surely, 2^687534207391 is an apocalyptic number.

687534207391 is a deficient number, since it is larger than the sum of its proper divisors (1).

687534207391 is an equidigital number, since it uses as much as digits as its factorization.

687534207391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7620480, while the sum is 55.

The spelling of 687534207391 in words is "six hundred eighty-seven billion, five hundred thirty-four million, two hundred seven thousand, three hundred ninety-one".