642481 has 8 divisors (see below), whose sum is σ = 777600. Its totient is φ = 518208.

The previous prime is 642457. The next prime is 642487. The reversal of 642481 is 184246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642481 - 2⁹ = 641969 is a prime.

It is a super-2 number, since 2×642481² = 825563670722, which contains 22 as substring.

It is a Duffinian number.

642481 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2581 + ... + 2818.

It is an arithmetic number, because the mean of its divisors is an integer number (97200).

2⁶⁴²⁴⁸¹ is an apocalyptic number.

It is an amenable number.

642481 is a deficient number, since it is larger than the sum of its proper divisors (135119).

642481 is a wasteful number, since it uses less digits than its factorization.

642481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5423.

The product of its digits is 1536, while the sum is 25.

The square root of 642481 is about 801.5491251321. The cubic root of 642481 is about 86.2886013588.

The spelling of 642481 in words is "six hundred forty-two thousand, four hundred eighty-one".