42161543 has 8 divisors (see below), whose sum is σ = 43528848. Its totient is φ = 40811904.

The previous prime is 42161501. The next prime is 42161557. The reversal of 42161543 is 34516124.

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 42161543 - 2¹⁶ = 42096007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42161573) 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, 521 + ... + 9197.

It is an arithmetic number, because the mean of its divisors is an integer number (5441106).

Almost surely, 2^42161543 is an apocalyptic number.

42161543 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

42161543 is a deficient number, since it is larger than the sum of its proper divisors (1367305).

42161543 is a wasteful number, since it uses less digits than its factorization.

42161543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8833.

The product of its digits is 2880, while the sum is 26.

The square root of 42161543 is about 6493.1920501399. The cubic root of 42161543 is about 348.0477512974.

Adding to 42161543 its reverse (34516124), we get a palindrome (76677667).

The spelling of 42161543 in words is "forty-two million, one hundred sixty-one thousand, five hundred forty-three".