423681991709 has 2 divisors, whose sum is σ = 423681991710. Its totient is φ = 423681991708.

The previous prime is 423681991669. The next prime is 423681991721. The reversal of 423681991709 is 907199186324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 398274588100 + 25407403609 = 631090^2 + 159397^2 .

It is a cyclic number.

It is not a de Polignac number, because 423681991709 - 2¹² = 423681987613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423681991769) 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, 211840995854 + 211840995855.

It is an arithmetic number, because the mean of its divisors is an integer number (211840995855).

Almost surely, 2^423681991709 is an apocalyptic number.

It is an amenable number.

423681991709 is a deficient number, since it is larger than the sum of its proper divisors (1).

423681991709 is an equidigital number, since it uses as much as digits as its factorization.

423681991709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5878656, while the sum is 59.

The spelling of 423681991709 in words is "four hundred twenty-three billion, six hundred eighty-one million, nine hundred ninety-one thousand, seven hundred nine".