42712289 has 2 divisors, whose sum is σ = 42712290. Its totient is φ = 42712288.

The previous prime is 42712249. The next prime is 42712291. The reversal of 42712289 is 98221724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40704400 + 2007889 = 6380^2 + 1417^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42712289 is a prime.

Together with 42712291, 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 (42712249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21356144 + 21356145.

It is an arithmetic number, because the mean of its divisors is an integer number (21356145).

Almost surely, 2^42712289 is an apocalyptic number.

It is an amenable number.

42712289 is a deficient number, since it is larger than the sum of its proper divisors (1).

42712289 is an equidigital number, since it uses as much as digits as its factorization.

42712289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 42712289 is about 6535.4639468059. The cubic root of 42712289 is about 349.5566877144.

The spelling of 42712289 in words is "forty-two million, seven hundred twelve thousand, two hundred eighty-nine".