1992191321 has 2 divisors, whose sum is σ = 1992191322. Its totient is φ = 1992191320.

The previous prime is 1992191309. The next prime is 1992191323. The reversal of 1992191321 is 1231912991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1885296400 + 106894921 = 43420^2 + 10339^2 .

It is a cyclic number.

It is not a de Polignac number, because 1992191321 - 2²⁶ = 1925082457 is a prime.

Together with 1992191323, 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 (1992191323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 996095660 + 996095661.

It is an arithmetic number, because the mean of its divisors is an integer number (996095661).

Almost surely, 2^1992191321 is an apocalyptic number.

It is an amenable number.

1992191321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1992191321 is an equidigital number, since it uses as much as digits as its factorization.

1992191321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 38.

The square root of 1992191321 is about 44633.9704821339. The cubic root of 1992191321 is about 1258.2791914057.

The spelling of 1992191321 in words is "one billion, nine hundred ninety-two million, one hundred ninety-one thousand, three hundred twenty-one".