42581615 has 4 divisors (see below), whose sum is σ = 51097944. Its totient is φ = 34065288.

The previous prime is 42581593. The next prime is 42581633. The reversal of 42581615 is 51618524.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42581615 - 2⁸ = 42581359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4258157 + ... + 4258166.

It is an arithmetic number, because the mean of its divisors is an integer number (12774486).

Almost surely, 2^42581615 is an apocalyptic number.

42581615 is a deficient number, since it is larger than the sum of its proper divisors (8516329).

42581615 is an equidigital number, since it uses as much as digits as its factorization.

42581615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8516328.

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

The square root of 42581615 is about 6525.4589876881. The cubic root of 42581615 is about 349.1998455860.

The spelling of 42581615 in words is "forty-two million, five hundred eighty-one thousand, six hundred fifteen".