1213311293 has 2 divisors, whose sum is σ = 1213311294. Its totient is φ = 1213311292.

The previous prime is 1213311287. The next prime is 1213311317. The reversal of 1213311293 is 3921133121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 673817764 + 539493529 = 25958^2 + 23227^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213311293 - 2⁸ = 1213311037 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213317293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606655646 + 606655647.

It is an arithmetic number, because the mean of its divisors is an integer number (606655647).

Almost surely, 2^1213311293 is an apocalyptic number.

It is an amenable number.

1213311293 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213311293 is an equidigital number, since it uses as much as digits as its factorization.

1213311293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 26.

The square root of 1213311293 is about 34832.6182334891. The cubic root of 1213311293 is about 1066.5733958267.

The spelling of 1213311293 in words is "one billion, two hundred thirteen million, three hundred eleven thousand, two hundred ninety-three".