42311320409 has 2 divisors, whose sum is σ = 42311320410. Its totient is φ = 42311320408.

The previous prime is 42311320399. The next prime is 42311320477. The reversal of 42311320409 is 90402311324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29582968009 + 12728352400 = 171997^2 + 112820^2 .

It is a cyclic number.

It is not a de Polignac number, because 42311320409 - 2²⁸ = 42042884953 is a prime.

It is not a weakly prime, because it can be changed into another prime (42311320309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21155660204 + 21155660205.

It is an arithmetic number, because the mean of its divisors is an integer number (21155660205).

Almost surely, 2^42311320409 is an apocalyptic number.

It is an amenable number.

42311320409 is a deficient number, since it is larger than the sum of its proper divisors (1).

42311320409 is an equidigital number, since it uses as much as digits as its factorization.

42311320409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 42311320409 in words is "forty-two billion, three hundred eleven million, three hundred twenty thousand, four hundred nine".