993999630431 has 2 divisors, whose sum is σ = 993999630432. Its totient is φ = 993999630430.

The previous prime is 993999630413. The next prime is 993999630433. The reversal of 993999630431 is 134036999399.

Together with previous prime (993999630413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 993999630431 - 2¹⁰ = 993999629407 is a prime.

It is a super-2 number, since 2×993999630431² (a number of 25 digits) contains 22 as substring.

Together with 993999630433, 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 (993999630433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496999815215 + 496999815216.

It is an arithmetic number, because the mean of its divisors is an integer number (496999815216).

Almost surely, 2^993999630431 is an apocalyptic number.

993999630431 is a deficient number, since it is larger than the sum of its proper divisors (1).

993999630431 is an equidigital number, since it uses as much as digits as its factorization.

993999630431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38263752, while the sum is 65.

The spelling of 993999630431 in words is "nine hundred ninety-three billion, nine hundred ninety-nine million, six hundred thirty thousand, four hundred thirty-one".