637160681 has 2 divisors, whose sum is σ = 637160682. Its totient is φ = 637160680.

The previous prime is 637160659. The next prime is 637160723. The reversal of 637160681 is 186061736.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 461863081 + 175297600 = 21491^2 + 13240^2 .

It is a cyclic number.

It is not a de Polignac number, because 637160681 - 2⁶ = 637160617 is a prime.

It is a super-2 number, since 2×637160681² = 811947466824767522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (637160981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318580340 + 318580341.

It is an arithmetic number, because the mean of its divisors is an integer number (318580341).

Almost surely, 2^637160681 is an apocalyptic number.

It is an amenable number.

637160681 is a deficient number, since it is larger than the sum of its proper divisors (1).

637160681 is an equidigital number, since it uses as much as digits as its factorization.

637160681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 637160681 is about 25242.0419340433. The cubic root of 637160681 is about 860.4975852226.

The spelling of 637160681 in words is "six hundred thirty-seven million, one hundred sixty thousand, six hundred eighty-one".