545736621 has 4 divisors (see below), whose sum is σ = 727648832. Its totient is φ = 363824412.

The previous prime is 545736619. The next prime is 545736637. The reversal of 545736621 is 126637545.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 545736621 - 2¹ = 545736619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 545736621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545736671) 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, 90956101 + ... + 90956106.

It is an arithmetic number, because the mean of its divisors is an integer number (181912208).

Almost surely, 2^545736621 is an apocalyptic number.

It is an amenable number.

545736621 is a deficient number, since it is larger than the sum of its proper divisors (181912211).

545736621 is a wasteful number, since it uses less digits than its factorization.

545736621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181912210.

The product of its digits is 151200, while the sum is 39.

The square root of 545736621 is about 23361.0064209571. The cubic root of 545736621 is about 817.1987604109.

The spelling of 545736621 in words is "five hundred forty-five million, seven hundred thirty-six thousand, six hundred twenty-one".