687101797 has 2 divisors, whose sum is σ = 687101798. Its totient is φ = 687101796.

The previous prime is 687101771. The next prime is 687101819. The reversal of 687101797 is 797101786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 615089601 + 72012196 = 24801^2 + 8486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687101797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687101897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343550898 + 343550899.

It is an arithmetic number, because the mean of its divisors is an integer number (343550899).

Almost surely, 2^687101797 is an apocalyptic number.

It is an amenable number.

687101797 is a deficient number, since it is larger than the sum of its proper divisors (1).

687101797 is an equidigital number, since it uses as much as digits as its factorization.

687101797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 148176, while the sum is 46.

The square root of 687101797 is about 26212.6266711293. The cubic root of 687101797 is about 882.4166514921.

It can be divided in two parts, 68710 and 1797, that added together give a palindrome (70507).

The spelling of 687101797 in words is "six hundred eighty-seven million, one hundred one thousand, seven hundred ninety-seven".