1155520440101 has 4 divisors (see below), whose sum is σ = 1155524775372. Its totient is φ = 1155516104832.

The previous prime is 1155520440091. The next prime is 1155520440121. The reversal of 1155520440101 is 1010440255511.

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 1104077664001 + 51442776100 = 1050751^2 + 226810^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155520440101 - 2⁶ = 1155520440037 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 (1155520440121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1739660 + ... + 2310293.

It is an arithmetic number, because the mean of its divisors is an integer number (288881193843).

Almost surely, 2^{1155520440101} is an apocalyptic number.

It is an amenable number.

1155520440101 is a deficient number, since it is larger than the sum of its proper divisors (4335271).

1155520440101 is an equidigital number, since it uses as much as digits as its factorization.

1155520440101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4335270.

The product of its (nonzero) digits is 4000, while the sum is 29.

Adding to 1155520440101 its reverse (1010440255511), we get a palindrome (2165960695612).

The spelling of 1155520440101 in words is "one trillion, one hundred fifty-five billion, five hundred twenty million, four hundred forty thousand, one hundred one".