1211013331309 has 2 divisors, whose sum is σ = 1211013331310. Its totient is φ = 1211013331308.

The previous prime is 1211013331267. The next prime is 1211013331349. The reversal of 1211013331309 is 9031333101121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 943365412900 + 267647918409 = 971270^2 + 517347^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211013331309 - 2¹¹ = 1211013329261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211013331349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605506665654 + 605506665655.

It is an arithmetic number, because the mean of its divisors is an integer number (605506665655).

Almost surely, 2^{1211013331309} is an apocalyptic number.

It is an amenable number.

1211013331309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211013331309 is an equidigital number, since it uses as much as digits as its factorization.

1211013331309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 28.

The spelling of 1211013331309 in words is "one trillion, two hundred eleven billion, thirteen million, three hundred thirty-one thousand, three hundred nine".