1131320778901 has 2 divisors, whose sum is σ = 1131320778902. Its totient is φ = 1131320778900.

The previous prime is 1131320778893. The next prime is 1131320778923. The reversal of 1131320778901 is 1098770231311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 965500794801 + 165819984100 = 982599^2 + 407210^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131320778901 - 2³ = 1131320778893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131320778001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565660389450 + 565660389451.

It is an arithmetic number, because the mean of its divisors is an integer number (565660389451).

Almost surely, 2^{1131320778901} is an apocalyptic number.

It is an amenable number.

1131320778901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131320778901 is an equidigital number, since it uses as much as digits as its factorization.

1131320778901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 43.

The spelling of 1131320778901 in words is "one trillion, one hundred thirty-one billion, three hundred twenty million, seven hundred seventy-eight thousand, nine hundred one".