42111287 has 2 divisors, whose sum is σ = 42111288. Its totient is φ = 42111286.

The previous prime is 42111281. The next prime is 42111313. The reversal of 42111287 is 78211124.

It is an a-pointer prime, because the next prime (42111313) can be obtained adding 42111287 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42111287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42111281) 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, 21055643 + 21055644.

It is an arithmetic number, because the mean of its divisors is an integer number (21055644).

Almost surely, 2^42111287 is an apocalyptic number.

42111287 is a deficient number, since it is larger than the sum of its proper divisors (1).

42111287 is an equidigital number, since it uses as much as digits as its factorization.

42111287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 896, while the sum is 26.

The square root of 42111287 is about 6489.3209968378. The cubic root of 42111287 is about 347.9094068804.

The spelling of 42111287 in words is "forty-two million, one hundred eleven thousand, two hundred eighty-seven".