42561215 has 8 divisors (see below), whose sum is σ = 51150528. Its totient is φ = 33997600.

The previous prime is 42561209. The next prime is 42561221. The reversal of 42561215 is 51216524.

It is an interprime number because it is at equal distance from previous prime (42561209) and next prime (42561221).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42561215 - 2⁴ = 42561199 is a prime.

It is a super-2 number, since 2×42561215² = 3622914044552450, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 2567 + ... + 9576.

It is an arithmetic number, because the mean of its divisors is an integer number (6393816).

Almost surely, 2^42561215 is an apocalyptic number.

42561215 is a deficient number, since it is larger than the sum of its proper divisors (8589313).

42561215 is a wasteful number, since it uses less digits than its factorization.

42561215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12849.

The product of its digits is 2400, while the sum is 26.

The square root of 42561215 is about 6523.8956919926. The cubic root of 42561215 is about 349.1440717913.

Adding to 42561215 its reverse (51216524), we get a palindrome (93777739).

The spelling of 42561215 in words is "forty-two million, five hundred sixty-one thousand, two hundred fifteen".