42889261 has 2 divisors, whose sum is σ = 42889262. Its totient is φ = 42889260.

The previous prime is 42889247. The next prime is 42889277. The reversal of 42889261 is 16298824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38812900 + 4076361 = 6230^2 + 2019^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42889261 is a prime.

It is a super-2 number, since 2×42889261² = 3678977418252242, which contains 22 as substring.

It is equal to p_2598286 and since 42889261 and 2598286 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42889291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21444630 + 21444631.

It is an arithmetic number, because the mean of its divisors is an integer number (21444631).

Almost surely, 2^42889261 is an apocalyptic number.

It is an amenable number.

42889261 is a deficient number, since it is larger than the sum of its proper divisors (1).

42889261 is an equidigital number, since it uses as much as digits as its factorization.

42889261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 40.

The square root of 42889261 is about 6548.9893113365. The cubic root of 42889261 is about 350.0388011405.

The spelling of 42889261 in words is "forty-two million, eight hundred eighty-nine thousand, two hundred sixty-one".