641520479 has 8 divisors (see below), whose sum is σ = 665548800. Its totient is φ = 617700600.

The previous prime is 641520433. The next prime is 641520497. The reversal of 641520479 is 974025146.

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

It is a cyclic number.

It is not a de Polignac number, because 641520479 - 2¹⁶ = 641454943 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 (641520409) 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, 45827 + ... + 58164.

It is an arithmetic number, because the mean of its divisors is an integer number (83193600).

Almost surely, 2^641520479 is an apocalyptic number.

641520479 is a deficient number, since it is larger than the sum of its proper divisors (24028321).

641520479 is a wasteful number, since it uses less digits than its factorization.

641520479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104221.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 641520479 is about 25328.2545588913. The cubic root of 641520479 is about 862.4557889261.

The spelling of 641520479 in words is "six hundred forty-one million, five hundred twenty thousand, four hundred seventy-nine".