689634041 has 2 divisors, whose sum is σ = 689634042. Its totient is φ = 689634040.

The previous prime is 689634031. The next prime is 689634119. The reversal of 689634041 is 140436986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 434305600 + 255328441 = 20840^2 + 15979^2 .

It is a cyclic number.

It is not a de Polignac number, because 689634041 - 2¹⁰ = 689633017 is a prime.

It is a super-2 number, since 2×689634041² = 951190221011979362, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 689634041.

It is not a weakly prime, because it can be changed into another prime (689634031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344817020 + 344817021.

It is an arithmetic number, because the mean of its divisors is an integer number (344817021).

Almost surely, 2^689634041 is an apocalyptic number.

It is an amenable number.

689634041 is a deficient number, since it is larger than the sum of its proper divisors (1).

689634041 is an equidigital number, since it uses as much as digits as its factorization.

689634041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 689634041 is about 26260.8842387304. The cubic root of 689634041 is about 883.4993415616.

The spelling of 689634041 in words is "six hundred eighty-nine million, six hundred thirty-four thousand, forty-one".