993988031 has 2 divisors, whose sum is σ = 993988032. Its totient is φ = 993988030.

The previous prime is 993988013. The next prime is 993988067. The reversal of 993988031 is 130889399.

Together with previous prime (993988013) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 993988031 - 2²⁶ = 926879167 is a prime.

It is a super-2 number, since 2×993988031² = 1976024411542513922, which 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 (993988231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496994015 + 496994016.

It is an arithmetic number, because the mean of its divisors is an integer number (496994016).

Almost surely, 2^993988031 is an apocalyptic number.

993988031 is a deficient number, since it is larger than the sum of its proper divisors (1).

993988031 is an equidigital number, since it uses as much as digits as its factorization.

993988031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 50.

The square root of 993988031 is about 31527.5757234837. The cubic root of 993988031 is about 997.9919808915.

The spelling of 993988031 in words is "nine hundred ninety-three million, nine hundred eighty-eight thousand, thirty-one".