1020111311231 has 2 divisors, whose sum is σ = 1020111311232. Its totient is φ = 1020111311230.

The previous prime is 1020111311203. The next prime is 1020111311287. The reversal of 1020111311231 is 1321131110201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1020111311231 - 2²² = 1020107116927 is a prime.

It is a super-2 number, since 2×1020111311231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020111311431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510055655615 + 510055655616.

It is an arithmetic number, because the mean of its divisors is an integer number (510055655616).

Almost surely, 2^{1020111311231} is an apocalyptic number.

1020111311231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020111311231 is an equidigital number, since it uses as much as digits as its factorization.

1020111311231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 1020111311231 its reverse (1321131110201), we get a palindrome (2341242421432).

The spelling of 1020111311231 in words is "one trillion, twenty billion, one hundred eleven million, three hundred eleven thousand, two hundred thirty-one".