42572561 has 2 divisors, whose sum is σ = 42572562. Its totient is φ = 42572560.

The previous prime is 42572513. The next prime is 42572567. The reversal of 42572561 is 16527524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32993536 + 9579025 = 5744^2 + 3095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42572561 is a prime.

It is not a weakly prime, because it can be changed into another prime (42572567) 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, 21286280 + 21286281.

It is an arithmetic number, because the mean of its divisors is an integer number (21286281).

Almost surely, 2^42572561 is an apocalyptic number.

It is an amenable number.

42572561 is a deficient number, since it is larger than the sum of its proper divisors (1).

42572561 is an equidigital number, since it uses as much as digits as its factorization.

42572561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 32.

The square root of 42572561 is about 6524.7652065036. The cubic root of 42572561 is about 349.1750940627.

The spelling of 42572561 in words is "forty-two million, five hundred seventy-two thousand, five hundred sixty-one".