687042253 has 2 divisors, whose sum is σ = 687042254. Its totient is φ = 687042252.

The previous prime is 687042247. The next prime is 687042263. The reversal of 687042253 is 352240786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657307044 + 29735209 = 25638^2 + 5453^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687042253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687042203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343521126 + 343521127.

It is an arithmetic number, because the mean of its divisors is an integer number (343521127).

Almost surely, 2^687042253 is an apocalyptic number.

It is an amenable number.

687042253 is a deficient number, since it is larger than the sum of its proper divisors (1).

687042253 is an equidigital number, since it uses as much as digits as its factorization.

687042253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 687042253 is about 26211.4908580187. The cubic root of 687042253 is about 882.3911607836.

The spelling of 687042253 in words is "six hundred eighty-seven million, forty-two thousand, two hundred fifty-three".