1005111051091 has 16 divisors (see below), whose sum is σ = 1181074553856. Its totient is φ = 837294113376.

The previous prime is 1005111051089. The next prime is 1005111051097. The reversal of 1005111051091 is 1901501115001.

It is not a de Polignac number, because 1005111051091 - 2¹ = 1005111051089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1005111051097) 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 15 ways as a sum of consecutive naturals, for example, 1957831 + ... + 2417296.

It is an arithmetic number, because the mean of its divisors is an integer number (73817159616).

Almost surely, 2^{1005111051091} is an apocalyptic number.

1005111051091 is a deficient number, since it is larger than the sum of its proper divisors (175963502765).

1005111051091 is an equidigital number, since it uses as much as digits as its factorization.

1005111051091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4376058.

The product of its (nonzero) digits is 225, while the sum is 25.

Adding to 1005111051091 its reverse (1901501115001), we get a palindrome (2906612166092).

The spelling of 1005111051091 in words is "one trillion, five billion, one hundred eleven million, fifty-one thousand, ninety-one".