1211172479999 has 2 divisors, whose sum is σ = 1211172480000. Its totient is φ = 1211172479998.

The previous prime is 1211172479939. The next prime is 1211172480059. The reversal of 1211172479999 is 9999742711121.

It is a balanced prime because it is at equal distance from previous prime (1211172479939) and next prime (1211172480059).

It is a cyclic number.

It is not a de Polignac number, because 1211172479999 - 2⁴⁰ = 111660852223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211172479929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605586239999 + 605586240000.

It is an arithmetic number, because the mean of its divisors is an integer number (605586240000).

Almost surely, 2^{1211172479999} is an apocalyptic number.

1211172479999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211172479999 is an equidigital number, since it uses as much as digits as its factorization.

1211172479999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5143824, while the sum is 62.

The spelling of 1211172479999 in words is "one trillion, two hundred eleven billion, one hundred seventy-two million, four hundred seventy-nine thousand, nine hundred ninety-nine".