687631211 has 2 divisors, whose sum is σ = 687631212. Its totient is φ = 687631210.

The previous prime is 687631201. The next prime is 687631271. The reversal of 687631211 is 112136786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687631211 - 2²⁶ = 620522347 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (687631201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343815605 + 343815606.

It is an arithmetic number, because the mean of its divisors is an integer number (343815606).

Almost surely, 2^687631211 is an apocalyptic number.

687631211 is a deficient number, since it is larger than the sum of its proper divisors (1).

687631211 is an equidigital number, since it uses as much as digits as its factorization.

687631211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 687631211 is about 26222.7231804784. The cubic root of 687631211 is about 882.6432282036.

Adding to 687631211 its reverse (112136786), we get a palindrome (799767997).

The spelling of 687631211 in words is "six hundred eighty-seven million, six hundred thirty-one thousand, two hundred eleven".