42510561 has 4 divisors (see below), whose sum is σ = 56680752. Its totient is φ = 28340372.

The previous prime is 42510553. The next prime is 42510569. The reversal of 42510561 is 16501524.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (42510553) and next prime (42510569).

It is a cyclic number.

It is not a de Polignac number, because 42510561 - 2³ = 42510553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42510569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7085091 + ... + 7085096.

It is an arithmetic number, because the mean of its divisors is an integer number (14170188).

Almost surely, 2^42510561 is an apocalyptic number.

It is an amenable number.

42510561 is a deficient number, since it is larger than the sum of its proper divisors (14170191).

42510561 is a wasteful number, since it uses less digits than its factorization.

42510561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14170190.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 42510561 is about 6520.0123466141. The cubic root of 42510561 is about 349.0055061624.

It can be divided in two parts, 42510 and 561, that added together give a triangular number (43071 = T₂₉₃).

The spelling of 42510561 in words is "forty-two million, five hundred ten thousand, five hundred sixty-one".