601643261 has 2 divisors, whose sum is σ = 601643262. Its totient is φ = 601643260.

The previous prime is 601643239. The next prime is 601643353. The reversal of 601643261 is 162346106.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 332880025 + 268763236 = 18245^2 + 16394^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-601643261 is a prime.

It is a super-3 number, since 3×601643261³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 (601643201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 300821630 + 300821631.

It is an arithmetic number, because the mean of its divisors is an integer number (300821631).

Almost surely, 2^601643261 is an apocalyptic number.

It is an amenable number.

601643261 is a deficient number, since it is larger than the sum of its proper divisors (1).

601643261 is an equidigital number, since it uses as much as digits as its factorization.

601643261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 601643261 is about 24528.4174173549. The cubic root of 601643261 is about 844.2019523206.

Adding to 601643261 its reverse (162346106), we get a palindrome (763989367).

The spelling of 601643261 in words is "six hundred one million, six hundred forty-three thousand, two hundred sixty-one".