687054161 has 2 divisors, whose sum is σ = 687054162. Its totient is φ = 687054160.

The previous prime is 687054157. The next prime is 687054227. The reversal of 687054161 is 161450786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 478078225 + 208975936 = 21865^2 + 14456^2 .

It is a cyclic number.

It is not a de Polignac number, because 687054161 - 2² = 687054157 is a prime.

It is not a weakly prime, because it can be changed into another prime (687054061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343527080 + 343527081.

It is an arithmetic number, because the mean of its divisors is an integer number (343527081).

Almost surely, 2^687054161 is an apocalyptic number.

It is an amenable number.

687054161 is a deficient number, since it is larger than the sum of its proper divisors (1).

687054161 is an equidigital number, since it uses as much as digits as its factorization.

687054161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 687054161 is about 26211.7180093179. The cubic root of 687054161 is about 882.3962587006.

The spelling of 687054161 in words is "six hundred eighty-seven million, fifty-four thousand, one hundred sixty-one".