641020249 has 2 divisors, whose sum is σ = 641020250. Its totient is φ = 641020248.

The previous prime is 641020243. The next prime is 641020273. The reversal of 641020249 is 942020146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 597460249 + 43560000 = 24443^2 + 6600^2 .

It is a cyclic number.

It is not a de Polignac number, because 641020249 - 2¹⁷ = 640889177 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (641020243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320510124 + 320510125.

It is an arithmetic number, because the mean of its divisors is an integer number (320510125).

Almost surely, 2^641020249 is an apocalyptic number.

It is an amenable number.

641020249 is a deficient number, since it is larger than the sum of its proper divisors (1).

641020249 is an equidigital number, since it uses as much as digits as its factorization.

641020249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 641020249 is about 25318.3776928934. The cubic root of 641020249 is about 862.2315620267.

The spelling of 641020249 in words is "six hundred forty-one million, twenty thousand, two hundred forty-nine".