1031212111291 has 2 divisors, whose sum is σ = 1031212111292. Its totient is φ = 1031212111290.

The previous prime is 1031212111273. The next prime is 1031212111357. The reversal of 1031212111291 is 1921112121301.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1031212111291 is a prime.

It is not a weakly prime, because it can be changed into another prime (1031212111231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515606055645 + 515606055646.

It is an arithmetic number, because the mean of its divisors is an integer number (515606055646).

Almost surely, 2^{1031212111291} is an apocalyptic number.

1031212111291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1031212111291 is an equidigital number, since it uses as much as digits as its factorization.

1031212111291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 25.

Adding to 1031212111291 its reverse (1921112121301), we get a palindrome (2952324232592).

The spelling of 1031212111291 in words is "one trillion, thirty-one billion, two hundred twelve million, one hundred eleven thousand, two hundred ninety-one".