641527 has 4 divisors (see below), whose sum is σ = 657216. Its totient is φ = 625840.

The previous prime is 641521. The next prime is 641549. The reversal of 641527 is 725146.

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

It is a cyclic number.

It is not a de Polignac number, because 641527 - 2³ = 641519 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 (641521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7783 + ... + 7864.

It is an arithmetic number, because the mean of its divisors is an integer number (164304).

2⁶⁴¹⁵²⁷ is an apocalyptic number.

641527 is a deficient number, since it is larger than the sum of its proper divisors (15689).

641527 is a wasteful number, since it uses less digits than its factorization.

641527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15688.

The product of its digits is 1680, while the sum is 25.

The square root of 641527 is about 800.9538064083. The cubic root of 641527 is about 86.2458711179.

The spelling of 641527 in words is "six hundred forty-one thousand, five hundred twenty-seven".