641534 has 4 divisors (see below), whose sum is σ = 962304. Its totient is φ = 320766.

The previous prime is 641521. The next prime is 641549. The reversal of 641534 is 435146.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 435146 = 2 ⋅217573.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 160382 + ... + 160385.

It is an arithmetic number, because the mean of its divisors is an integer number (240576).

2⁶⁴¹⁵³⁴ is an apocalyptic number.

641534 is a deficient number, since it is larger than the sum of its proper divisors (320770).

641534 is a wasteful number, since it uses less digits than its factorization.

641534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320769.

The product of its digits is 1440, while the sum is 23.

The square root of 641534 is about 800.9581761865. The cubic root of 641534 is about 86.2461848064.

The spelling of 641534 in words is "six hundred forty-one thousand, five hundred thirty-four".