1091198020911 has 16 divisors (see below), whose sum is σ = 1499808031200. Its totient is φ = 705172860288.

The previous prime is 1091198020883. The next prime is 1091198020933. The reversal of 1091198020911 is 1190208911901.

It is not a de Polignac number, because 1091198020911 - 2¹³ = 1091198012719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091198020961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18242656 + ... + 18302373.

It is an arithmetic number, because the mean of its divisors is an integer number (93738001950).

Almost surely, 2^{1091198020911} is an apocalyptic number.

1091198020911 is a deficient number, since it is larger than the sum of its proper divisors (408610010289).

1091198020911 is a wasteful number, since it uses less digits than its factorization.

1091198020911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36545338.

The product of its (nonzero) digits is 11664, while the sum is 42.

The spelling of 1091198020911 in words is "one trillion, ninety-one billion, one hundred ninety-eight million, twenty thousand, nine hundred eleven".