42081549 has 8 divisors (see below), whose sum is σ = 56664672. Its totient is φ = 27776400.

The previous prime is 42081541. The next prime is 42081569. The reversal of 42081549 is 94518024.

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

It is not a de Polignac number, because 42081549 - 2³ = 42081541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42081541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69139 + ... + 69744.

It is an arithmetic number, because the mean of its divisors is an integer number (7083084).

Almost surely, 2^42081549 is an apocalyptic number.

It is an amenable number.

42081549 is a deficient number, since it is larger than the sum of its proper divisors (14583123).

42081549 is a wasteful number, since it uses less digits than its factorization.

42081549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138987.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 42081549 is about 6487.0292892818. The cubic root of 42081549 is about 347.8274924497.

The spelling of 42081549 in words is "forty-two million, eighty-one thousand, five hundred forty-nine".