545791691 has 4 divisors (see below), whose sum is σ = 545842584. Its totient is φ = 545740800.

The previous prime is 545791669. The next prime is 545791693. The reversal of 545791691 is 196197545.

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, and also an emirpimes, since its reverse is a distinct semiprime: 196197545 = 5 ⋅39239509.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545791691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (545791693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2405 + ... + 33126.

It is an arithmetic number, because the mean of its divisors is an integer number (136460646).

Almost surely, 2^545791691 is an apocalyptic number.

545791691 is a deficient number, since it is larger than the sum of its proper divisors (50893).

545791691 is a wasteful number, since it uses less digits than its factorization.

545791691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50892.

The product of its digits is 340200, while the sum is 47.

The square root of 545791691 is about 23362.1850647580. The cubic root of 545791691 is about 817.2262471877.

The spelling of 545791691 in words is "five hundred forty-five million, seven hundred ninety-one thousand, six hundred ninety-one".