641605253 has 8 divisors (see below), whose sum is σ = 646488000. Its totient is φ = 636739488.

The previous prime is 641605207. The next prime is 641605297. The reversal of 641605253 is 352506146.

641605253 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641605253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641605453) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77450 + ... + 85332.

It is an arithmetic number, because the mean of its divisors is an integer number (80811000).

Almost surely, 2^641605253 is an apocalyptic number.

It is an amenable number.

641605253 is a deficient number, since it is larger than the sum of its proper divisors (4882747).

641605253 is a wasteful number, since it uses less digits than its factorization.

641605253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8491.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 641605253 is about 25329.9280101622. The cubic root of 641605253 is about 862.4937771168.

The spelling of 641605253 in words is "six hundred forty-one million, six hundred five thousand, two hundred fifty-three".