42581165 has 32 divisors (see below), whose sum is σ = 59657472. Its totient is φ = 28864000.

The previous prime is 42581153. The next prime is 42581171. The reversal of 42581165 is 56118524.

It is not a de Polignac number, because 42581165 - 2¹⁰ = 42580141 is a prime.

It is a super-2 number, since 2×42581165² = 3626311225514450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51455 + ... + 52275.

It is an arithmetic number, because the mean of its divisors is an integer number (1864296).

Almost surely, 2^42581165 is an apocalyptic number.

It is an amenable number.

42581165 is a deficient number, since it is larger than the sum of its proper divisors (17076307).

42581165 is a wasteful number, since it uses less digits than its factorization.

42581165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901.

The product of its digits is 9600, while the sum is 32.

The square root of 42581165 is about 6525.4245072639. The cubic root of 42581165 is about 349.1986154739.

Adding to 42581165 its reverse (56118524), we get a palindrome (98699689).

The spelling of 42581165 in words is "forty-two million, five hundred eighty-one thousand, one hundred sixty-five".