687454973 has 2 divisors, whose sum is σ = 687454974. Its totient is φ = 687454972.

The previous prime is 687454951. The next prime is 687455003. The reversal of 687454973 is 379454786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 597166969 + 90288004 = 24437^2 + 9502^2 .

It is a cyclic number.

It is not a de Polignac number, because 687454973 - 2¹⁸ = 687192829 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687454073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343727486 + 343727487.

It is an arithmetic number, because the mean of its divisors is an integer number (343727487).

Almost surely, 2^687454973 is an apocalyptic number.

It is an amenable number.

687454973 is a deficient number, since it is larger than the sum of its proper divisors (1).

687454973 is an equidigital number, since it uses as much as digits as its factorization.

687454973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 53.

The square root of 687454973 is about 26219.3625589945. The cubic root of 687454973 is about 882.5678154115.

The spelling of 687454973 in words is "six hundred eighty-seven million, four hundred fifty-four thousand, nine hundred seventy-three".