687531037 has 2 divisors, whose sum is σ = 687531038. Its totient is φ = 687531036.

The previous prime is 687531029. The next prime is 687531067. The reversal of 687531037 is 730135786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 599809081 + 87721956 = 24491^2 + 9366^2 .

It is a cyclic number.

It is not a de Polignac number, because 687531037 - 2³ = 687531029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687531007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343765518 + 343765519.

It is an arithmetic number, because the mean of its divisors is an integer number (343765519).

Almost surely, 2^687531037 is an apocalyptic number.

It is an amenable number.

687531037 is a deficient number, since it is larger than the sum of its proper divisors (1).

687531037 is an equidigital number, since it uses as much as digits as its factorization.

687531037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 687531037 is about 26220.8130499418. The cubic root of 687531037 is about 882.6003650161.

The spelling of 687531037 in words is "six hundred eighty-seven million, five hundred thirty-one thousand, thirty-seven".