687294997 has 2 divisors, whose sum is σ = 687294998. Its totient is φ = 687294996.

The previous prime is 687294913. The next prime is 687295003. The reversal of 687294997 is 799492786.

687294997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 424401201 + 262893796 = 20601^2 + 16214^2 .

It is a cyclic number.

It is not a de Polignac number, because 687294997 - 2¹⁵ = 687262229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687294497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343647498 + 343647499.

It is an arithmetic number, because the mean of its divisors is an integer number (343647499).

Almost surely, 2^687294997 is an apocalyptic number.

It is an amenable number.

687294997 is a deficient number, since it is larger than the sum of its proper divisors (1).

687294997 is an equidigital number, since it uses as much as digits as its factorization.

687294997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13716864, while the sum is 61.

The square root of 687294997 is about 26216.3116589653. The cubic root of 687294997 is about 882.4993500197.

The spelling of 687294997 in words is "six hundred eighty-seven million, two hundred ninety-four thousand, nine hundred ninety-seven".