641460521 has 8 divisors (see below), whose sum is σ = 691026504. Its totient is φ = 591926400.

The previous prime is 641460517. The next prime is 641460529. The reversal of 641460521 is 125064146.

It can be written as a sum of positive squares in 4 ways, for example, as 186704896 + 454755625 = 13664^2 + 21325^2 .

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

It is not a de Polignac number, because 641460521 - 2² = 641460517 is a prime.

It is a super-3 number, since 3×641460521³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (641460529) 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, 48971 + ... + 60671.

It is an arithmetic number, because the mean of its divisors is an integer number (86378313).

Almost surely, 2^641460521 is an apocalyptic number.

It is an amenable number.

641460521 is a deficient number, since it is larger than the sum of its proper divisors (49565983).

641460521 is a wasteful number, since it uses less digits than its factorization.

641460521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15931.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 641460521 is about 25327.0709123657. The cubic root of 641460521 is about 862.4289190459.

The spelling of 641460521 in words is "six hundred forty-one million, four hundred sixty thousand, five hundred twenty-one".