687250061 has 2 divisors, whose sum is σ = 687250062. Its totient is φ = 687250060.

The previous prime is 687250013. The next prime is 687250087. The reversal of 687250061 is 160052786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 352725961 + 334524100 = 18781^2 + 18290^2 .

It is a cyclic number.

It is not a de Polignac number, because 687250061 - 2¹⁰ = 687249037 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687250001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343625030 + 343625031.

It is an arithmetic number, because the mean of its divisors is an integer number (343625031).

Almost surely, 2^687250061 is an apocalyptic number.

It is an amenable number.

687250061 is a deficient number, since it is larger than the sum of its proper divisors (1).

687250061 is an equidigital number, since it uses as much as digits as its factorization.

687250061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 687250061 is about 26215.4546212725. The cubic root of 687250061 is about 882.4801167185.

The spelling of 687250061 in words is "six hundred eighty-seven million, two hundred fifty thousand, sixty-one".