923941781309 has 2 divisors, whose sum is σ = 923941781310. Its totient is φ = 923941781308.

The previous prime is 923941781261. The next prime is 923941781311. The reversal of 923941781309 is 903187149329.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 807476568409 + 116465212900 = 898597^2 + 341270^2 .

It is a cyclic number.

It is not a de Polignac number, because 923941781309 - 2⁸ = 923941781053 is a prime.

Together with 923941781311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (923941711309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 461970890654 + 461970890655.

It is an arithmetic number, because the mean of its divisors is an integer number (461970890655).

Almost surely, 2^923941781309 is an apocalyptic number.

It is an amenable number.

923941781309 is a deficient number, since it is larger than the sum of its proper divisors (1).

923941781309 is an equidigital number, since it uses as much as digits as its factorization.

923941781309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2939328, while the sum is 56.

The spelling of 923941781309 in words is "nine hundred twenty-three billion, nine hundred forty-one million, seven hundred eighty-one thousand, three hundred nine".