1091500473001 has 3 divisors (see below), whose sum is σ = 1091501517751. Its totient is φ = 1091499428252.

The previous prime is 1091500472989. The next prime is 1091500473053. The reversal of 1091500473001 is 1003740051901.

The square root of 1091500473001 is 1044749.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 990922693401 + 100577779600 = 995451^2 + 317140^2 .

It is not a de Polignac number, because 1091500473001 - 2²⁵ = 1091466918569 is a prime.

It is a super-2 number, since 2×1091500473001² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091501473001) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 522375 + ... + 1567123.

Almost surely, 2^{1091500473001} is an apocalyptic number.

1091500473001 is the 1044749-th square number.

1091500473001 is the 522375-th centered octagonal number.

It is an amenable number.

1091500473001 is a deficient number, since it is larger than the sum of its proper divisors (1044750).

1091500473001 is an frugal number, since it uses more digits than its factorization.

1091500473001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2089498 (or 1044749 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 31.

The spelling of 1091500473001 in words is "one trillion, ninety-one billion, five hundred million, four hundred seventy-three thousand, one".