1999947211 has 2 divisors, whose sum is σ = 1999947212. Its totient is φ = 1999947210.

The previous prime is 1999947143. The next prime is 1999947233. The reversal of 1999947211 is 1127499991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1999947211 - 2²⁷ = 1865729483 is a prime.

It is not a weakly prime, because it can be changed into another prime (1999947251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999973605 + 999973606.

It is an arithmetic number, because the mean of its divisors is an integer number (999973606).

Almost surely, 2^1999947211 is an apocalyptic number.

1999947211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999947211 is an equidigital number, since it uses as much as digits as its factorization.

1999947211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 52.

The square root of 1999947211 is about 44720.7693471389. The cubic root of 1999947211 is about 1259.9099648020.

The spelling of 1999947211 in words is "one billion, nine hundred ninety-nine million, nine hundred forty-seven thousand, two hundred eleven".