1311161021099 has 4 divisors (see below), whose sum is σ = 1311232738464. Its totient is φ = 1311089303736.

The previous prime is 1311161021081. The next prime is 1311161021117. The reversal of 1311161021099 is 9901201611131.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1311161021081) and next prime (1311161021117).

It is a cyclic number.

It is not a de Polignac number, because 1311161021099 - 2⁸ = 1311161020843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311161021069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35831252 + ... + 35867825.

It is an arithmetic number, because the mean of its divisors is an integer number (327808184616).

Almost surely, 2^{1311161021099} is an apocalyptic number.

1311161021099 is a deficient number, since it is larger than the sum of its proper divisors (71717365).

1311161021099 is an equidigital number, since it uses as much as digits as its factorization.

1311161021099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71717364.

The product of its (nonzero) digits is 2916, while the sum is 35.

The spelling of 1311161021099 in words is "one trillion, three hundred eleven billion, one hundred sixty-one million, twenty-one thousand, ninety-nine".