642281471 has 16 divisors (see below), whose sum is σ = 734073984. Its totient is φ = 556706304.

The previous prime is 642281459. The next prime is 642281477. The reversal of 642281471 is 174182246.

It is a cyclic number.

It is not a de Polignac number, because 642281471 - 2²⁶ = 575172607 is a prime.

It is a super-3 number, since 3×642281471³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642281477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99185 + ... + 105461.

It is an arithmetic number, because the mean of its divisors is an integer number (45879624).

Almost surely, 2^642281471 is an apocalyptic number.

642281471 is a deficient number, since it is larger than the sum of its proper divisors (91792513).

642281471 is a wasteful number, since it uses less digits than its factorization.

642281471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770.

The product of its digits is 21504, while the sum is 35.

The square root of 642281471 is about 25343.2726971084. The cubic root of 642281471 is about 862.7966783347.

The spelling of 642281471 in words is "six hundred forty-two million, two hundred eighty-one thousand, four hundred seventy-one".