42144481 has 2 divisors, whose sum is σ = 42144482. Its totient is φ = 42144480.

The previous prime is 42144457. The next prime is 42144497. The reversal of 42144481 is 18444124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40844881 + 1299600 = 6391^2 + 1140^2 .

It is a cyclic number.

It is not a de Polignac number, because 42144481 - 2⁷ = 42144353 is a prime.

It is a super-2 number, since 2×42144481² = 3552314557518722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42114481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21072240 + 21072241.

It is an arithmetic number, because the mean of its divisors is an integer number (21072241).

Almost surely, 2^42144481 is an apocalyptic number.

It is an amenable number.

42144481 is a deficient number, since it is larger than the sum of its proper divisors (1).

42144481 is an equidigital number, since it uses as much as digits as its factorization.

42144481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4096, while the sum is 28.

The square root of 42144481 is about 6491.8780795699. The cubic root of 42144481 is about 348.0007954577. Note that the first 3 decimals are identical.

The spelling of 42144481 in words is "forty-two million, one hundred forty-four thousand, four hundred eighty-one".