687670651 has 2 divisors, whose sum is σ = 687670652. Its totient is φ = 687670650.

The previous prime is 687670639. The next prime is 687670661. The reversal of 687670651 is 156076786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687670651 - 2⁵ = 687670619 is a prime.

It is not a weakly prime, because it can be changed into another prime (687670661) 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, 343835325 + 343835326.

It is an arithmetic number, because the mean of its divisors is an integer number (343835326).

Almost surely, 2^687670651 is an apocalyptic number.

687670651 is a deficient number, since it is larger than the sum of its proper divisors (1).

687670651 is an equidigital number, since it uses as much as digits as its factorization.

687670651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 687670651 is about 26223.4751892269. The cubic root of 687670651 is about 882.6601029386.

The spelling of 687670651 in words is "six hundred eighty-seven million, six hundred seventy thousand, six hundred fifty-one".