641502 has 24 divisors (see below), whose sum is σ = 1404936. Its totient is φ = 211536.

The previous prime is 641491. The next prime is 641513. The reversal of 641502 is 205146.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (641491) and next prime (641513).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

641502 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2713 + ... + 2939.

It is an arithmetic number, because the mean of its divisors is an integer number (58539).

2⁶⁴¹⁵⁰² is an apocalyptic number.

641502 is an abundant number, since it is smaller than the sum of its proper divisors (763434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

641502 is a wasteful number, since it uses less digits than its factorization.

641502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 641502 is about 800.9381998631. The cubic root of 641502 is about 86.2447507832.

Adding to 641502 its reverse (205146), we get a palindrome (846648).

The spelling of 641502 in words is "six hundred forty-one thousand, five hundred two".