545597581 has 4 divisors (see below), whose sum is σ = 545644512. Its totient is φ = 545550652.

The previous prime is 545597567. The next prime is 545597587. The reversal of 545597581 is 185795545.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 545597581 - 2¹⁵ = 545564813 is a prime.

It is a super-2 number, since 2×545597581² = 595353440786103122, which contains 22 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 (545597587) 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, 8376 + ... + 34078.

It is an arithmetic number, because the mean of its divisors is an integer number (136411128).

Almost surely, 2^545597581 is an apocalyptic number.

It is an amenable number.

545597581 is a deficient number, since it is larger than the sum of its proper divisors (46931).

545597581 is a wasteful number, since it uses less digits than its factorization.

545597581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46930.

The product of its digits is 1260000, while the sum is 49.

The square root of 545597581 is about 23358.0303322005. The cubic root of 545597581 is about 817.1293539352.

The spelling of 545597581 in words is "five hundred forty-five million, five hundred ninety-seven thousand, five hundred eighty-one".