1011531186409 has 2 divisors, whose sum is σ = 1011531186410. Its totient is φ = 1011531186408.

The previous prime is 1011531186389. The next prime is 1011531186467. The reversal of 1011531186409 is 9046811351101.

It is a happy number.

1011531186409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 990194157225 + 21337029184 = 995085^2 + 146072^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011531186409 - 2⁹ = 1011531185897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1011531186499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505765593204 + 505765593205.

It is an arithmetic number, because the mean of its divisors is an integer number (505765593205).

Almost surely, 2^{1011531186409} is an apocalyptic number.

It is an amenable number.

1011531186409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011531186409 is an equidigital number, since it uses as much as digits as its factorization.

1011531186409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 40.

The spelling of 1011531186409 in words is "one trillion, eleven billion, five hundred thirty-one million, one hundred eighty-six thousand, four hundred nine".