992131993 has 4 divisors (see below), whose sum is σ = 992338128. Its totient is φ = 991925860.

The previous prime is 992131957. The next prime is 992131997. The reversal of 992131993 is 399131299.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 399131299 = 7 ⋅57018757.

It is a cyclic number.

It is not a de Polignac number, because 992131993 - 2¹⁷ = 992000921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (992131997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95671 + ... + 105532.

It is an arithmetic number, because the mean of its divisors is an integer number (248084532).

Almost surely, 2^992131993 is an apocalyptic number.

It is an amenable number.

992131993 is a deficient number, since it is larger than the sum of its proper divisors (206135).

992131993 is a wasteful number, since it uses less digits than its factorization.

992131993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206134.

The product of its digits is 118098, while the sum is 46.

The square root of 992131993 is about 31498.1268173204. The cubic root of 992131993 is about 997.3704223824.

It can be divided in two parts, 9921 and 31993, that added together give a palindrome (41914).

The spelling of 992131993 in words is "nine hundred ninety-two million, one hundred thirty-one thousand, nine hundred ninety-three".