545403781 has 4 divisors (see below), whose sum is σ = 587357932. Its totient is φ = 503449632.

The previous prime is 545403773. The next prime is 545403799. The reversal of 545403781 is 187304545.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28569025 + 516834756 = 5345^2 + 22734^2 .

It is a cyclic number.

It is not a de Polignac number, because 545403781 - 2³ = 545403773 is a prime.

It is a super-2 number, since 2×545403781² = 594930568658191922, which contains 22 as substring.

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 545403781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545403731) 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, 20977056 + ... + 20977081.

It is an arithmetic number, because the mean of its divisors is an integer number (146839483).

Almost surely, 2^545403781 is an apocalyptic number.

It is an amenable number.

545403781 is a deficient number, since it is larger than the sum of its proper divisors (41954151).

545403781 is a wasteful number, since it uses less digits than its factorization.

545403781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41954150.

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 545403781 is about 23353.8814975156. The cubic root of 545403781 is about 817.0325924953.

The spelling of 545403781 in words is "five hundred forty-five million, four hundred three thousand, seven hundred eighty-one".