42144217 has 2 divisors, whose sum is σ = 42144218. Its totient is φ = 42144216.

The previous prime is 42144161. The next prime is 42144227. The reversal of 42144217 is 71244124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40653376 + 1490841 = 6376^2 + 1221^2 .

It is a cyclic number.

It is not a de Polignac number, because 42144217 - 2¹¹ = 42142169 is a prime.

It is a super-2 number, since 2×42144217² = 3552270053086178, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42144191 and 42144200.

It is not a weakly prime, because it can be changed into another prime (42144227) 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, 21072108 + 21072109.

It is an arithmetic number, because the mean of its divisors is an integer number (21072109).

Almost surely, 2^42144217 is an apocalyptic number.

It is an amenable number.

42144217 is a deficient number, since it is larger than the sum of its proper divisors (1).

42144217 is an equidigital number, since it uses as much as digits as its factorization.

42144217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1792, while the sum is 25.

The square root of 42144217 is about 6491.8577464390. The cubic root of 42144217 is about 348.0000688114. Note that the first 4 decimals are identical.

Subtracting from 42144217 its sum of digits (25), we obtain a cube (42144192 = 348³).

The spelling of 42144217 in words is "forty-two million, one hundred forty-four thousand, two hundred seventeen".