42620561 has 4 divisors (see below), whose sum is σ = 43018992. Its totient is φ = 42222132.

The previous prime is 42620551. The next prime is 42620569. The reversal of 42620561 is 16502624.

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 a cyclic number.

It is not a de Polignac number, because 42620561 - 2⁶ = 42620497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42620561.

It is not an unprimeable number, because it can be changed into a prime (42620569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199055 + ... + 199268.

It is an arithmetic number, because the mean of its divisors is an integer number (10754748).

Almost surely, 2^42620561 is an apocalyptic number.

It is an amenable number.

42620561 is a deficient number, since it is larger than the sum of its proper divisors (398431).

42620561 is a wasteful number, since it uses less digits than its factorization.

42620561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398430.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 42620561 is about 6528.4424635590. The cubic root of 42620561 is about 349.3062748751.

The spelling of 42620561 in words is "forty-two million, six hundred twenty thousand, five hundred sixty-one".