687133757 has 2 divisors, whose sum is σ = 687133758. Its totient is φ = 687133756.

The previous prime is 687133723. The next prime is 687133781. The reversal of 687133757 is 757331786.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 683770201 + 3363556 = 26149^2 + 1834^2 .

It is a cyclic number.

It is not a de Polignac number, because 687133757 - 2¹⁸ = 686871613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687133787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343566878 + 343566879.

It is an arithmetic number, because the mean of its divisors is an integer number (343566879).

Almost surely, 2^687133757 is an apocalyptic number.

It is an amenable number.

687133757 is a deficient number, since it is larger than the sum of its proper divisors (1).

687133757 is an equidigital number, since it uses as much as digits as its factorization.

687133757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 740880, while the sum is 47.

The square root of 687133757 is about 26213.2362939031. The cubic root of 687133757 is about 882.4303329190.

The spelling of 687133757 in words is "six hundred eighty-seven million, one hundred thirty-three thousand, seven hundred fifty-seven".