641305153 has 4 divisors (see below), whose sum is σ = 661992448. Its totient is φ = 620617860.

The previous prime is 641305151. The next prime is 641305163. The reversal of 641305153 is 351503146.

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, and also an emirpimes, since its reverse is a distinct semiprime: 351503146 = 2 ⋅175751573.

It is a cyclic number.

It is not a de Polignac number, because 641305153 - 2¹ = 641305151 is a prime.

It is a super-2 number, since 2×641305153² = 822544598528706818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641305151) 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, 10343601 + ... + 10343662.

It is an arithmetic number, because the mean of its divisors is an integer number (165498112).

Almost surely, 2^641305153 is an apocalyptic number.

It is an amenable number.

641305153 is a deficient number, since it is larger than the sum of its proper divisors (20687295).

641305153 is a wasteful number, since it uses less digits than its factorization.

641305153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20687294.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 641305153 is about 25324.0034947083. The cubic root of 641305153 is about 862.3592838558.

Adding to 641305153 its reverse (351503146), we get a palindrome (992808299).

The spelling of 641305153 in words is "six hundred forty-one million, three hundred five thousand, one hundred fifty-three".