42868961 has 2 divisors, whose sum is σ = 42868962. Its totient is φ = 42868960.

The previous prime is 42868907. The next prime is 42868963. The reversal of 42868961 is 16986824.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26214400 + 16654561 = 5120^2 + 4081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42868961 is a prime.

Together with 42868963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42868963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21434480 + 21434481.

It is an arithmetic number, because the mean of its divisors is an integer number (21434481).

Almost surely, 2^42868961 is an apocalyptic number.

It is an amenable number.

42868961 is a deficient number, since it is larger than the sum of its proper divisors (1).

42868961 is an equidigital number, since it uses as much as digits as its factorization.

42868961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 44.

The square root of 42868961 is about 6547.4392704324. The cubic root of 42868961 is about 349.9835665754.

The spelling of 42868961 in words is "forty-two million, eight hundred sixty-eight thousand, nine hundred sixty-one".