1311161021101 has 4 divisors (see below), whose sum is σ = 1322764216092. Its totient is φ = 1299557826112.

The previous prime is 1311161021081. The next prime is 1311161021117. The reversal of 1311161021101 is 1011201611131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11675018601 + 1299486002500 = 108051^2 + 1139950^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311161021101 - 2⁵ = 1311161021069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311161021201) 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, 5801597326 + ... + 5801597551.

It is an arithmetic number, because the mean of its divisors is an integer number (330691054023).

Almost surely, 2^{1311161021101} is an apocalyptic number.

It is an amenable number.

1311161021101 is a deficient number, since it is larger than the sum of its proper divisors (11603194991).

1311161021101 is a wasteful number, since it uses less digits than its factorization.

1311161021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11603194990.

The product of its (nonzero) digits is 36, while the sum is 19.

Adding to 1311161021101 its reverse (1011201611131), we get a palindrome (2322362632232).

The spelling of 1311161021101 in words is "one trillion, three hundred eleven billion, one hundred sixty-one million, twenty-one thousand, one hundred one".