923396605991 has 2 divisors, whose sum is σ = 923396605992. Its totient is φ = 923396605990.

The previous prime is 923396605969. The next prime is 923396606009. The reversal of 923396605991 is 199506693329.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-923396605991 is a prime.

It is a super-2 number, since 2×923396605991² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (923396605591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 461698302995 + 461698302996.

It is an arithmetic number, because the mean of its divisors is an integer number (461698302996).

Almost surely, 2^923396605991 is an apocalyptic number.

923396605991 is a deficient number, since it is larger than the sum of its proper divisors (1).

923396605991 is an equidigital number, since it uses as much as digits as its factorization.

923396605991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21257640, while the sum is 62.

The spelling of 923396605991 in words is "nine hundred twenty-three billion, three hundred ninety-six million, six hundred five thousand, nine hundred ninety-one".