42512561 has 8 divisors (see below), whose sum is σ = 52323264. Its totient is φ = 33636240.

The previous prime is 42512551. The next prime is 42512567. The reversal of 42512561 is 16521524.

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 42512561 - 2¹⁰ = 42511537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42512561.

It is not an unprimeable number, because it can be changed into a prime (42512567) 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, 233495 + ... + 233676.

It is an arithmetic number, because the mean of its divisors is an integer number (6540408).

Almost surely, 2^42512561 is an apocalyptic number.

It is an amenable number.

42512561 is a deficient number, since it is larger than the sum of its proper divisors (9810703).

42512561 is a wasteful number, since it uses less digits than its factorization.

42512561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467191.

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

The square root of 42512561 is about 6520.1657187529. The cubic root of 42512561 is about 349.0109793127.

The spelling of 42512561 in words is "forty-two million, five hundred twelve thousand, five hundred sixty-one".