641542 has 16 divisors (see below), whose sum is σ = 1062864. Its totient is φ = 290400.

The previous prime is 641521. The next prime is 641549. The reversal of 641542 is 245146.

It is a super-2 number, since 2×641542² = 823152275528, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641549) by changing a digit.

641542 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 7 ways as a sum of consecutive naturals, for example, 2542 + ... + 2782.

It is an arithmetic number, because the mean of its divisors is an integer number (66429).

2⁶⁴¹⁵⁴² is an apocalyptic number.

641542 is a deficient number, since it is larger than the sum of its proper divisors (421322).

641542 is a wasteful number, since it uses less digits than its factorization.

641542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276 (or 254 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 641542 is about 800.9631701895. The cubic root of 641542 is about 86.2465433047.

641542 divided by its sum of digits (22) gives a triangular number (29161 = T₂₄₁).

Adding to 641542 its reverse (245146), we get a palindrome (886688).

The spelling of 641542 in words is "six hundred forty-one thousand, five hundred forty-two".