641257237 has 18 divisors (see below), whose sum is σ = 675055158. Its totient is φ = 609113232.

The previous prime is 641257231. The next prime is 641257247. The reversal of 641257237 is 732752146.

It is a happy number.

641257237 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 494217361 + 147039876 = 22231^2 + 12126^2 .

It is not a de Polignac number, because 641257237 - 2⁷ = 641257109 is a prime.

It is a super-2 number, since 2×641257237² = 822421688009748338, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 641257196 and 641257205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641257231) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4084363 + ... + 4084519.

Almost surely, 2^641257237 is an apocalyptic number.

It is an amenable number.

641257237 is a deficient number, since it is larger than the sum of its proper divisors (33797921).

641257237 is an equidigital number, since it uses as much as digits as its factorization.

641257237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337 (or 247 counting only the distinct ones).

The product of its digits is 70560, while the sum is 37.

The square root of 641257237 is about 25323.0574180923. The cubic root of 641257237 is about 862.3378058660.

The spelling of 641257237 in words is "six hundred forty-one million, two hundred fifty-seven thousand, two hundred thirty-seven".