687372401 has 2 divisors, whose sum is σ = 687372402. Its totient is φ = 687372400.

The previous prime is 687372397. The next prime is 687372403. The reversal of 687372401 is 104273786.

687372401 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., 675948001 + 11424400 = 25999^2 + 3380^2 .

It is a cyclic number.

It is not a de Polignac number, because 687372401 - 2² = 687372397 is a prime.

It is a Sophie Germain prime.

Together with 687372403, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (687372403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343686200 + 343686201.

It is an arithmetic number, because the mean of its divisors is an integer number (343686201).

Almost surely, 2^687372401 is an apocalyptic number.

It is an amenable number.

687372401 is a deficient number, since it is larger than the sum of its proper divisors (1).

687372401 is an equidigital number, since it uses as much as digits as its factorization.

687372401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 687372401 is about 26217.7878738844. The cubic root of 687372401 is about 882.5324781601.

The spelling of 687372401 in words is "six hundred eighty-seven million, three hundred seventy-two thousand, four hundred one".