1211103887951 has 2 divisors, whose sum is σ = 1211103887952. Its totient is φ = 1211103887950.

The previous prime is 1211103887923. The next prime is 1211103887977. The reversal of 1211103887951 is 1597883011121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1211103887951 - 2²² = 1211099693647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211103887896 and 1211103887905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211103887911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605551943975 + 605551943976.

It is an arithmetic number, because the mean of its divisors is an integer number (605551943976).

Almost surely, 2^{1211103887951} is an apocalyptic number.

1211103887951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211103887951 is an equidigital number, since it uses as much as digits as its factorization.

1211103887951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 47.

The spelling of 1211103887951 in words is "one trillion, two hundred eleven billion, one hundred three million, eight hundred eighty-seven thousand, nine hundred fifty-one".