2091545645 has 12 divisors (see below), whose sum is σ = 2919627324. Its totient is φ = 1434202560.

The previous prime is 2091545629. The next prime is 2091545647. The reversal of 2091545645 is 5465451902.

It can be written as a sum of positive squares in 2 ways, for example, as 416935561 + 1674610084 = 20419^2 + 40922^2 .

It is not a de Polignac number, because 2091545645 - 2⁴ = 2091545629 is a prime.

It is a super-3 number, since 3×2091545645³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091545647) 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 11 ways as a sum of consecutive naturals, for example, 4268216 + ... + 4268705.

It is an arithmetic number, because the mean of its divisors is an integer number (243302277).

Almost surely, 2^2091545645 is an apocalyptic number.

It is an amenable number.

2091545645 is a deficient number, since it is larger than the sum of its proper divisors (828081679).

2091545645 is an equidigital number, since it uses as much as digits as its factorization.

2091545645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8536940 (or 8536933 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 41.

The square root of 2091545645 is about 45733.4193451572. The cubic root of 2091545645 is about 1278.8583662333.

The spelling of 2091545645 in words is "two billion, ninety-one million, five hundred forty-five thousand, six hundred forty-five".