641244949 has 4 divisors (see below), whose sum is σ = 650276640. Its totient is φ = 632213260.

The previous prime is 641244941. The next prime is 641244959. The reversal of 641244949 is 949442146.

641244949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 641244949 - 2³ = 641244941 is a prime.

It is a super-2 number, since 2×641244949² = 822390169236025202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641244941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4515739 + ... + 4515880.

It is an arithmetic number, because the mean of its divisors is an integer number (162569160).

Almost surely, 2^641244949 is an apocalyptic number.

It is an amenable number.

641244949 is a deficient number, since it is larger than the sum of its proper divisors (9031691).

641244949 is an equidigital number, since it uses as much as digits as its factorization.

641244949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9031690.

The product of its digits is 248832, while the sum is 43.

The square root of 641244949 is about 25322.8147921988. The cubic root of 641244949 is about 862.3322976893.

The spelling of 641244949 in words is "six hundred forty-one million, two hundred forty-four thousand, nine hundred forty-nine".