42820631879 has 2 divisors, whose sum is σ = 42820631880. Its totient is φ = 42820631878.

The previous prime is 42820631851. The next prime is 42820631881. The reversal of 42820631879 is 97813602824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42820631879 - 2²⁴ = 42803854663 is a prime.

It is a Sophie Germain prime.

Together with 42820631881, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42820631899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21410315939 + 21410315940.

It is an arithmetic number, because the mean of its divisors is an integer number (21410315940).

Almost surely, 2^42820631879 is an apocalyptic number.

42820631879 is a deficient number, since it is larger than the sum of its proper divisors (1).

42820631879 is an equidigital number, since it uses as much as digits as its factorization.

42820631879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 42820631879 in words is "forty-two billion, eight hundred twenty million, six hundred thirty-one thousand, eight hundred seventy-nine".