999997403926931 has 2 divisors, whose sum is σ = 999997403926932. Its totient is φ = 999997403926930.

The previous prime is 999997403926919. The next prime is 999997403926933. The reversal of 999997403926931 is 139629304799999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999997403926931 - 2¹⁰ = 999997403925907 is a prime.

It is a super-2 number, since 2×999997403926931² (a number of 31 digits) contains 22 as substring.

Together with 999997403926933, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999997403926933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499998701963465 + 499998701963466.

It is an arithmetic number, because the mean of its divisors is an integer number (499998701963466).

Almost surely, 2^{999997403926931} is an apocalyptic number.

999997403926931 is a deficient number, since it is larger than the sum of its proper divisors (1).

999997403926931 is an equidigital number, since it uses as much as digits as its factorization.

999997403926931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14463698256, while the sum is 89.

The spelling of 999997403926931 in words is "nine hundred ninety-nine trillion, nine hundred ninety-seven billion, four hundred three million, nine hundred twenty-six thousand, nine hundred thirty-one".