42027561 has 6 divisors (see below), whose sum is σ = 60706490. Its totient is φ = 28018368.

The previous prime is 42027539. The next prime is 42027577. The reversal of 42027561 is 16572024.

It can be written as a sum of positive squares in only one way, i.e., 27625536 + 14402025 = 5256^2 + 3795^2 .

It is not a de Polignac number, because 42027561 - 2¹⁷ = 41896489 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42027511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2334856 + ... + 2334873.

Almost surely, 2^42027561 is an apocalyptic number.

It is an amenable number.

42027561 is a deficient number, since it is larger than the sum of its proper divisors (18678929).

42027561 is a wasteful number, since it uses less digits than its factorization.

42027561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4669735 (or 4669732 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 42027561 is about 6482.8667269966. The cubic root of 42027561 is about 347.6786818079.

Adding to 42027561 its reverse (16572024), we get a palindrome (58599585).

The spelling of 42027561 in words is "forty-two million, twenty-seven thousand, five hundred sixty-one".