42641781 has 32 divisors (see below), whose sum is σ = 70667520. Its totient is φ = 22270464.

The previous prime is 42641779. The next prime is 42641783. The reversal of 42641781 is 18714624.

42641781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (42641779) and next prime (42641783).

It is not a de Polignac number, because 42641781 - 2¹ = 42641779 is a prime.

It is a super-2 number, since 2×42641781² = 3636642973703922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42641783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29041 + ... + 30473.

It is an arithmetic number, because the mean of its divisors is an integer number (2208360).

Almost surely, 2^42641781 is an apocalyptic number.

It is an amenable number.

42641781 is a deficient number, since it is larger than the sum of its proper divisors (28025739).

42641781 is a wasteful number, since it uses less digits than its factorization.

42641781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565.

The product of its digits is 10752, while the sum is 33.

The square root of 42641781 is about 6530.0674575382. The cubic root of 42641781 is about 349.3642363313.

The spelling of 42641781 in words is "forty-two million, six hundred forty-one thousand, seven hundred eighty-one".