1999950971 has 2 divisors, whose sum is σ = 1999950972. Its totient is φ = 1999950970.

The previous prime is 1999950959. The next prime is 1999950991. The reversal of 1999950971 is 1790599991.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999950971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1999950971.

It is not a weakly prime, because it can be changed into another prime (1999950991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999975485 + 999975486.

It is an arithmetic number, because the mean of its divisors is an integer number (999975486).

Almost surely, 2^1999950971 is an apocalyptic number.

1999950971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999950971 is an equidigital number, since it uses as much as digits as its factorization.

1999950971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2066715, while the sum is 59.

The square root of 1999950971 is about 44720.8113857519. The cubic root of 1999950971 is about 1259.9107543659.

The spelling of 1999950971 in words is "one billion, nine hundred ninety-nine million, nine hundred fifty thousand, nine hundred seventy-one".