1211213287 has 2 divisors, whose sum is σ = 1211213288. Its totient is φ = 1211213286.

The previous prime is 1211213249. The next prime is 1211213329. The reversal of 1211213287 is 7823121121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211213287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211213587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605606643 + 605606644.

It is an arithmetic number, because the mean of its divisors is an integer number (605606644).

Almost surely, 2^1211213287 is an apocalyptic number.

1211213287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211213287 is an equidigital number, since it uses as much as digits as its factorization.

1211213287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 28.

The square root of 1211213287 is about 34802.4896666891. The cubic root of 1211213287 is about 1065.9582834472.

The spelling of 1211213287 in words is "one billion, two hundred eleven million, two hundred thirteen thousand, two hundred eighty-seven".