42732281 has 2 divisors, whose sum is σ = 42732282. Its totient is φ = 42732280.

The previous prime is 42732253. The next prime is 42732289. The reversal of 42732281 is 18223724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37515625 + 5216656 = 6125^2 + 2284^2 .

It is a cyclic number.

It is not a de Polignac number, because 42732281 - 2¹⁰ = 42731257 is a prime.

It is a super-2 number, since 2×42732281² = 3652095678925922, 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 (42732289) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21366140 + 21366141.

It is an arithmetic number, because the mean of its divisors is an integer number (21366141).

Almost surely, 2^42732281 is an apocalyptic number.

It is an amenable number.

42732281 is a deficient number, since it is larger than the sum of its proper divisors (1).

42732281 is an equidigital number, since it uses as much as digits as its factorization.

42732281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 29.

The square root of 42732281 is about 6536.9932690802. The cubic root of 42732281 is about 349.6112172766.

The spelling of 42732281 in words is "forty-two million, seven hundred thirty-two thousand, two hundred eighty-one".