423991909373 has 2 divisors, whose sum is σ = 423991909374. Its totient is φ = 423991909372.

The previous prime is 423991909261. The next prime is 423991909381. The reversal of 423991909373 is 373909199324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 403411711609 + 20580197764 = 635147^2 + 143458^2 .

It is a cyclic number.

It is not a de Polignac number, because 423991909373 - 2¹⁸ = 423991647229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423991909973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211995954686 + 211995954687.

It is an arithmetic number, because the mean of its divisors is an integer number (211995954687).

Almost surely, 2^423991909373 is an apocalyptic number.

It is an amenable number.

423991909373 is a deficient number, since it is larger than the sum of its proper divisors (1).

423991909373 is an equidigital number, since it uses as much as digits as its factorization.

423991909373 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9920232, while the sum is 59.

The spelling of 423991909373 in words is "four hundred twenty-three billion, nine hundred ninety-one million, nine hundred nine thousand, three hundred seventy-three".