687133723 has 2 divisors, whose sum is σ = 687133724. Its totient is φ = 687133722.

The previous prime is 687133687. The next prime is 687133757. The reversal of 687133723 is 327331786.

It is a happy number.

687133723 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 is a cyclic number.

It is not a de Polignac number, because 687133723 - 2¹⁷ = 687002651 is a prime.

It is not a weakly prime, because it can be changed into another prime (687133793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343566861 + 343566862.

It is an arithmetic number, because the mean of its divisors is an integer number (343566862).

Almost surely, 2^687133723 is an apocalyptic number.

687133723 is a deficient number, since it is larger than the sum of its proper divisors (1).

687133723 is an equidigital number, since it uses as much as digits as its factorization.

687133723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 40.

The square root of 687133723 is about 26213.2356453758. The cubic root of 687133723 is about 882.4303183645.

The spelling of 687133723 in words is "six hundred eighty-seven million, one hundred thirty-three thousand, seven hundred twenty-three".