42144161 has 2 divisors, whose sum is σ = 42144162. Its totient is φ = 42144160.

The previous prime is 42144143. The next prime is 42144217. The reversal of 42144161 is 16144124.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32993536 + 9150625 = 5744^2 + 3025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42144161 is a prime.

It is a super-2 number, since 2×42144161² = 3552260612787842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42144121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21072080 + 21072081.

It is an arithmetic number, because the mean of its divisors is an integer number (21072081).

Almost surely, 2^42144161 is an apocalyptic number.

It is an amenable number.

42144161 is a deficient number, since it is larger than the sum of its proper divisors (1).

42144161 is an equidigital number, since it uses as much as digits as its factorization.

42144161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768, while the sum is 23.

The square root of 42144161 is about 6491.8534333424. The cubic root of 42144161 is about 347.9999146739. Note that the first 4 decimals are identical.

Adding to 42144161 its reverse (16144124), we get a palindrome (58288285).

The spelling of 42144161 in words is "forty-two million, one hundred forty-four thousand, one hundred sixty-one".