1211009711 has 2 divisors, whose sum is σ = 1211009712. Its totient is φ = 1211009710.

The previous prime is 1211009689. The next prime is 1211009713. The reversal of 1211009711 is 1179001121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211009711 is a prime.

It is a Sophie Germain prime.

Together with 1211009713, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211009713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605504855 + 605504856.

It is an arithmetic number, because the mean of its divisors is an integer number (605504856).

Almost surely, 2^1211009711 is an apocalyptic number.

1211009711 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211009711 is an equidigital number, since it uses as much as digits as its factorization.

1211009711 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 23.

The square root of 1211009711 is about 34799.5648104973. The cubic root of 1211009711 is about 1065.8985593989.

The spelling of 1211009711 in words is "one billion, two hundred eleven million, nine thousand, seven hundred eleven".