42081169 has 9 divisors (see below), whose sum is σ = 45658683. Its totient is φ = 38766312.

The previous prime is 42081163. The next prime is 42081197. The reversal of 42081169 is 96118024.

It is a happy number.

The square root of 42081169 is 6487.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6225025 + 35856144 = 2495^2 + 5988^2 .

It is not a de Polignac number, because 42081169 - 2⁹ = 42080657 is a prime.

It is a super-2 number, since 2×42081169² = 3541649568813122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42081169.

It is not an unprimeable number, because it can be changed into a prime (42081163) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 84082 + ... + 84580.

It is an arithmetic number, because the mean of its divisors is an integer number (5073187).

Almost surely, 2^42081169 is an apocalyptic number.

42081169 is the 6487-th square number.

42081169 is the 3244-th centered octagonal number.

It is an amenable number.

42081169 is a deficient number, since it is larger than the sum of its proper divisors (3577514).

42081169 is an frugal number, since it uses more digits than its factorization.

42081169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The cubic root of 42081169 is about 347.8264454759.

The spelling of 42081169 in words is "forty-two million, eighty-one thousand, one hundred sixty-nine".