1999231051 has 2 divisors, whose sum is σ = 1999231052. Its totient is φ = 1999231050.

The previous prime is 1999230979. The next prime is 1999231061. The reversal of 1999231051 is 1501329991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1999231051 - 2¹⁷ = 1999099979 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1999230995 and 1999231013.

It is not a weakly prime, because it can be changed into another prime (1999231061) 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 as a sum of consecutive naturals, namely, 999615525 + 999615526.

It is an arithmetic number, because the mean of its divisors is an integer number (999615526).

Almost surely, 2^1999231051 is an apocalyptic number.

1999231051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999231051 is an equidigital number, since it uses as much as digits as its factorization.

1999231051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 40.

The square root of 1999231051 is about 44712.7616123182. The cubic root of 1999231051 is about 1259.7595600250.

The spelling of 1999231051 in words is "one billion, nine hundred ninety-nine million, two hundred thirty-one thousand, fifty-one".