42723390091 has 2 divisors, whose sum is σ = 42723390092. Its totient is φ = 42723390090.

The previous prime is 42723390071. The next prime is 42723390211. The reversal of 42723390091 is 19009332724.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42723390091 - 2¹⁵ = 42723357323 is a prime.

It is not a weakly prime, because it can be changed into another prime (42723390011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21361695045 + 21361695046.

It is an arithmetic number, because the mean of its divisors is an integer number (21361695046).

Almost surely, 2^42723390091 is an apocalyptic number.

42723390091 is a deficient number, since it is larger than the sum of its proper divisors (1).

42723390091 is an equidigital number, since it uses as much as digits as its factorization.

42723390091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 40.

The spelling of 42723390091 in words is "forty-two billion, seven hundred twenty-three million, three hundred ninety thousand, ninety-one".