641535 has 16 divisors (see below), whose sum is σ = 1080960. Its totient is φ = 324000.

The previous prime is 641521. The next prime is 641549. The reversal of 641535 is 535146.

It is an interprime number because it is at equal distance from previous prime (641521) and next prime (641549).

It is not a de Polignac number, because 641535 - 2⁴ = 641519 is a prime.

It is a plaindrome in base 8.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 841 + ... + 1410.

It is an arithmetic number, because the mean of its divisors is an integer number (67560).

2⁶⁴¹⁵³⁵ is an apocalyptic number.

641535 is a deficient number, since it is larger than the sum of its proper divisors (439425).

641535 is a wasteful number, since it uses less digits than its factorization.

641535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278.

The product of its digits is 1800, while the sum is 24.

The square root of 641535 is about 800.9588004386. The cubic root of 641535 is about 86.2462296188.

It can be divided in two parts, 641 and 535, that added together give a triangular number (1176 = T₄₈).

The spelling of 641535 in words is "six hundred forty-one thousand, five hundred thirty-five".