42561515 has 8 divisors (see below), whose sum is σ = 51155280. Its totient is φ = 33994912.

The previous prime is 42561511. The next prime is 42561517. The reversal of 42561515 is 51516524.

It is a happy number.

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 42561515 - 2² = 42561511 is a prime.

It is a super-3 number, since 3×42561515³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (42561511) 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, 3164 + ... + 9753.

It is an arithmetic number, because the mean of its divisors is an integer number (6394410).

Almost surely, 2^42561515 is an apocalyptic number.

42561515 is a deficient number, since it is larger than the sum of its proper divisors (8593765).

42561515 is a wasteful number, since it uses less digits than its factorization.

42561515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13581.

The product of its digits is 6000, while the sum is 29.

The square root of 42561515 is about 6523.9186843492. The cubic root of 42561515 is about 349.1448921233.

The spelling of 42561515 in words is "forty-two million, five hundred sixty-one thousand, five hundred fifteen".