641248253 has 4 divisors (see below), whose sum is σ = 641776380. Its totient is φ = 640720128.

The previous prime is 641248249. The next prime is 641248277. The reversal of 641248253 is 352842146.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 448677124 + 192571129 = 21182^2 + 13877^2 .

It is a cyclic number.

It is not a de Polignac number, because 641248253 - 2² = 641248249 is a prime.

It is a super-2 number, since 2×641248253² = 822398643951104018, 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 (641248453) 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, 262238 + ... + 264671.

It is an arithmetic number, because the mean of its divisors is an integer number (160444095).

Almost surely, 2^641248253 is an apocalyptic number.

It is an amenable number.

641248253 is a deficient number, since it is larger than the sum of its proper divisors (528127).

641248253 is a wasteful number, since it uses less digits than its factorization.

641248253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528126.

The product of its digits is 46080, while the sum is 35.

The square root of 641248253 is about 25322.8800297281. The cubic root of 641248253 is about 862.3337787359. Note that the first 3 decimals are identical.

The spelling of 641248253 in words is "six hundred forty-one million, two hundred forty-eight thousand, two hundred fifty-three".