687630497 has 2 divisors, whose sum is σ = 687630498. Its totient is φ = 687630496.

The previous prime is 687630431. The next prime is 687630509. The reversal of 687630497 is 794036786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 631215376 + 56415121 = 25124^2 + 7511^2 .

It is a cyclic number.

It is not a de Polignac number, because 687630497 - 2²⁰ = 686581921 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (687630407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343815248 + 343815249.

It is an arithmetic number, because the mean of its divisors is an integer number (343815249).

Almost surely, 2^687630497 is an apocalyptic number.

It is an amenable number.

687630497 is a deficient number, since it is larger than the sum of its proper divisors (1).

687630497 is an equidigital number, since it uses as much as digits as its factorization.

687630497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 50.

The square root of 687630497 is about 26222.7095663282. The cubic root of 687630497 is about 882.6429227068.

It can be divided in two parts, 6876 and 30497, that added together give a palindrome (37373).

The spelling of 687630497 in words is "six hundred eighty-seven million, six hundred thirty thousand, four hundred ninety-seven".