542451565 has 4 divisors (see below), whose sum is σ = 650941884. Its totient is φ = 433961248.

The previous prime is 542451557. The next prime is 542451599. The reversal of 542451565 is 565154245.

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 322166601 + 220284964 = 17949^2 + 14842^2 .

It is a cyclic number.

It is not a de Polignac number, because 542451565 - 2³ = 542451557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54245152 + ... + 54245161.

It is an arithmetic number, because the mean of its divisors is an integer number (162735471).

Almost surely, 2^542451565 is an apocalyptic number.

It is an amenable number.

542451565 is a deficient number, since it is larger than the sum of its proper divisors (108490319).

542451565 is a wasteful number, since it uses less digits than its factorization.

542451565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108490318.

The product of its digits is 120000, while the sum is 37.

The square root of 542451565 is about 23290.5896232792. The cubic root of 542451565 is about 815.5557527760. Note that the first 3 decimals are identical.

The spelling of 542451565 in words is "five hundred forty-two million, four hundred fifty-one thousand, five hundred sixty-five".