687303791 has 2 divisors, whose sum is σ = 687303792. Its totient is φ = 687303790.

The previous prime is 687303737. The next prime is 687303839. The reversal of 687303791 is 197303786.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687303791 is a prime.

It is a super-2 number, since 2×687303791² = 944773002245943362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687303191) 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, 343651895 + 343651896.

It is an arithmetic number, because the mean of its divisors is an integer number (343651896).

Almost surely, 2^687303791 is an apocalyptic number.

687303791 is a deficient number, since it is larger than the sum of its proper divisors (1).

687303791 is an equidigital number, since it uses as much as digits as its factorization.

687303791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 687303791 is about 26216.4793784368. The cubic root of 687303791 is about 882.5031138893.

The spelling of 687303791 in words is "six hundred eighty-seven million, three hundred three thousand, seven hundred ninety-one".