42817961 has 4 divisors (see below), whose sum is σ = 42857412. Its totient is φ = 42778512.

The previous prime is 42817939. The next prime is 42817967. The reversal of 42817961 is 16971824.

42817961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13278736 + 29539225 = 3644^2 + 5435^2 .

It is a cyclic number.

It is not a de Polignac number, because 42817961 - 2⁶ = 42817897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42817967) 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 3 ways as a sum of consecutive naturals, for example, 18050 + ... + 20283.

It is an arithmetic number, because the mean of its divisors is an integer number (10714353).

Almost surely, 2^42817961 is an apocalyptic number.

It is an amenable number.

42817961 is a deficient number, since it is larger than the sum of its proper divisors (39451).

42817961 is a wasteful number, since it uses less digits than its factorization.

42817961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39450.

The product of its digits is 24192, while the sum is 38.

The square root of 42817961 is about 6543.5434590136. The cubic root of 42817961 is about 349.8447229585.

The spelling of 42817961 in words is "forty-two million, eight hundred seventeen thousand, nine hundred sixty-one".