42310813 has 2 divisors, whose sum is σ = 42310814. Its totient is φ = 42310812.

The previous prime is 42310789. The next prime is 42310831. The reversal of 42310813 is 31801324.

42310813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (42310831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21178404 + 21132409 = 4602^2 + 4597^2 .

It is a cyclic number.

It is not a de Polignac number, because 42310813 - 2⁵ = 42310781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42310883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21155406 + 21155407.

It is an arithmetic number, because the mean of its divisors is an integer number (21155407).

Almost surely, 2^42310813 is an apocalyptic number.

It is an amenable number.

42310813 is a deficient number, since it is larger than the sum of its proper divisors (1).

42310813 is an equidigital number, since it uses as much as digits as its factorization.

42310813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 42310813 is about 6504.6762409823. The cubic root of 42310813 is about 348.4580137654.

It can be divided in two parts, 423 and 10813, that added together give a square (11236 = 106²).

The spelling of 42310813 in words is "forty-two million, three hundred ten thousand, eight hundred thirteen".