42561587 has 2 divisors, whose sum is σ = 42561588. Its totient is φ = 42561586.

The previous prime is 42561551. The next prime is 42561593. The reversal of 42561587 is 78516524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42561587 - 2⁸ = 42561331 is a prime.

It is a super-2 number, since 2×42561587² = 3622977375917138, which contains 22 as substring.

It is equal to p_2579681 and since 42561587 and 2579681 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42561587.

It is not a weakly prime, because it can be changed into another prime (42561517) 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 as a sum of consecutive naturals, namely, 21280793 + 21280794.

It is an arithmetic number, because the mean of its divisors is an integer number (21280794).

Almost surely, 2^42561587 is an apocalyptic number.

42561587 is a deficient number, since it is larger than the sum of its proper divisors (1).

42561587 is an equidigital number, since it uses as much as digits as its factorization.

42561587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 67200, while the sum is 38.

The square root of 42561587 is about 6523.9242025027. The cubic root of 42561587 is about 349.1450890024.

The spelling of 42561587 in words is "forty-two million, five hundred sixty-one thousand, five hundred eighty-seven".