42881101 has 2 divisors, whose sum is σ = 42881102. Its totient is φ = 42881100.

The previous prime is 42881099. The next prime is 42881159. The reversal of 42881101 is 10118824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25857225 + 17023876 = 5085^2 + 4126^2 .

It is a cyclic number.

It is not a de Polignac number, because 42881101 - 2¹ = 42881099 is a prime.

Together with 42881099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42881801) 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, 21440550 + 21440551.

It is an arithmetic number, because the mean of its divisors is an integer number (21440551).

Almost surely, 2^42881101 is an apocalyptic number.

It is an amenable number.

42881101 is a deficient number, since it is larger than the sum of its proper divisors (1).

42881101 is an equidigital number, since it uses as much as digits as its factorization.

42881101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 42881101 is about 6548.3662848072. The cubic root of 42881101 is about 350.0166005732.

Adding to 42881101 its reverse (10118824), we get a palindrome (52999925).

The spelling of 42881101 in words is "forty-two million, eight hundred eighty-one thousand, one hundred one".