1131312021989 has 2 divisors, whose sum is σ = 1131312021990. Its totient is φ = 1131312021988.

The previous prime is 1131312021967. The next prime is 1131312022067. The reversal of 1131312021989 is 9891202131311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1025014504900 + 106297517089 = 1012430^2 + 326033^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131312021989 - 2²⁰ = 1131310973413 is a prime.

It is a super-2 number, since 2×1131312021989² (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 (1131312021919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565656010994 + 565656010995.

It is an arithmetic number, because the mean of its divisors is an integer number (565656010995).

Almost surely, 2^{1131312021989} is an apocalyptic number.

It is an amenable number.

1131312021989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131312021989 is an equidigital number, since it uses as much as digits as its factorization.

1131312021989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 41.

The spelling of 1131312021989 in words is "one trillion, one hundred thirty-one billion, three hundred twelve million, twenty-one thousand, nine hundred eighty-nine".