42753281 has 2 divisors, whose sum is σ = 42753282. Its totient is φ = 42753280.

The previous prime is 42753239. The next prime is 42753301. The reversal of 42753281 is 18235724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32672656 + 10080625 = 5716^2 + 3175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42753281 is a prime.

It is a super-2 number, since 2×42753281² = 3655686072529922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42759281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21376640 + 21376641.

It is an arithmetic number, because the mean of its divisors is an integer number (21376641).

Almost surely, 2^42753281 is an apocalyptic number.

It is an amenable number.

42753281 is a deficient number, since it is larger than the sum of its proper divisors (1).

42753281 is an equidigital number, since it uses as much as digits as its factorization.

42753281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 32.

The square root of 42753281 is about 6538.5993148380. The cubic root of 42753281 is about 349.6684779162.

It can be divided in two parts, 42753 and 281, that added together give a palindrome (43034).

The spelling of 42753281 in words is "forty-two million, seven hundred fifty-three thousand, two hundred eighty-one".