42819811 has 2 divisors, whose sum is σ = 42819812. Its totient is φ = 42819810.

The previous prime is 42819797. The next prime is 42819823. The reversal of 42819811 is 11891824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42819811 - 2¹⁹ = 42295523 is a prime.

It is not a weakly prime, because it can be changed into another prime (42819851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21409905 + 21409906.

It is an arithmetic number, because the mean of its divisors is an integer number (21409906).

Almost surely, 2^42819811 is an apocalyptic number.

42819811 is a deficient number, since it is larger than the sum of its proper divisors (1).

42819811 is an equidigital number, since it uses as much as digits as its factorization.

42819811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 34.

The square root of 42819811 is about 6543.6848182045. The cubic root of 42819811 is about 349.8497613691.

The spelling of 42819811 in words is "forty-two million, eight hundred nineteen thousand, eight hundred eleven".