641516243 has 4 divisors (see below), whose sum is σ = 646567680. Its totient is φ = 636464808.

The previous prime is 641516237. The next prime is 641516251. The reversal of 641516243 is 342615146.

641516243 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 an emirpimes, since its reverse is a distinct semiprime: 342615146 = 2 ⋅171307573.

It is a cyclic number.

It is not a de Polignac number, because 641516243 - 2¹² = 641512147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641516203) 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, 2525528 + ... + 2525781.

It is an arithmetic number, because the mean of its divisors is an integer number (161641920).

Almost surely, 2^641516243 is an apocalyptic number.

641516243 is a deficient number, since it is larger than the sum of its proper divisors (5051437).

641516243 is a wasteful number, since it uses less digits than its factorization.

641516243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5051436.

The product of its digits is 17280, while the sum is 32.

The square root of 641516243 is about 25328.1709367258. The cubic root of 641516243 is about 862.4538906387.

The spelling of 641516243 in words is "six hundred forty-one million, five hundred sixteen thousand, two hundred forty-three".