641221613237 has 2 divisors, whose sum is σ = 641221613238. Its totient is φ = 641221613236.

The previous prime is 641221613233. The next prime is 641221613257. The reversal of 641221613237 is 732316122146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 348750483601 + 292471129636 = 590551^2 + 540806^2 .

It is a cyclic number.

It is not a de Polignac number, because 641221613237 - 2² = 641221613233 is a prime.

It is a super-2 number, since 2×641221613237² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 641221613237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641221613233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320610806618 + 320610806619.

It is an arithmetic number, because the mean of its divisors is an integer number (320610806619).

Almost surely, 2^641221613237 is an apocalyptic number.

It is an amenable number.

641221613237 is a deficient number, since it is larger than the sum of its proper divisors (1).

641221613237 is an equidigital number, since it uses as much as digits as its factorization.

641221613237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 38.

The spelling of 641221613237 in words is "six hundred forty-one billion, two hundred twenty-one million, six hundred thirteen thousand, two hundred thirty-seven".