42812279 has 2 divisors, whose sum is σ = 42812280. Its totient is φ = 42812278.

The previous prime is 42812261. The next prime is 42812299. The reversal of 42812279 is 97221824.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42812279 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42812249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21406139 + 21406140.

It is an arithmetic number, because the mean of its divisors is an integer number (21406140).

Almost surely, 2^42812279 is an apocalyptic number.

42812279 is a deficient number, since it is larger than the sum of its proper divisors (1).

42812279 is an equidigital number, since it uses as much as digits as its factorization.

42812279 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 42812279 is about 6543.1092761775. The cubic root of 42812279 is about 349.8292473216.

The spelling of 42812279 in words is "forty-two million, eight hundred twelve thousand, two hundred seventy-nine".