1211320867 has 2 divisors, whose sum is σ = 1211320868. Its totient is φ = 1211320866.

The previous prime is 1211320861. The next prime is 1211320897. The reversal of 1211320867 is 7680231121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211320867 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211320861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605660433 + 605660434.

It is an arithmetic number, because the mean of its divisors is an integer number (605660434).

Almost surely, 2^1211320867 is an apocalyptic number.

1211320867 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211320867 is an equidigital number, since it uses as much as digits as its factorization.

1211320867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 1211320867 is about 34804.0352114521. The cubic root of 1211320867 is about 1065.9898419949.

Adding to 1211320867 its reverse (7680231121), we get a palindrome (8891551988).

The spelling of 1211320867 in words is "one billion, two hundred eleven million, three hundred twenty thousand, eight hundred sixty-seven".