42637289 has 2 divisors, whose sum is σ = 42637290. Its totient is φ = 42637288.

The previous prime is 42637267. The next prime is 42637291. The reversal of 42637289 is 98273624.

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., 23931664 + 18705625 = 4892^2 + 4325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42637289 is a prime.

Together with 42637291, 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 (42637229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21318644 + 21318645.

It is an arithmetic number, because the mean of its divisors is an integer number (21318645).

Almost surely, 2^42637289 is an apocalyptic number.

It is an amenable number.

42637289 is a deficient number, since it is larger than the sum of its proper divisors (1).

42637289 is an equidigital number, since it uses as much as digits as its factorization.

42637289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 41.

The square root of 42637289 is about 6529.7235010374. The cubic root of 42637289 is about 349.3519682441.

The spelling of 42637289 in words is "forty-two million, six hundred thirty-seven thousand, two hundred eighty-nine".