542451505 has 4 divisors (see below), whose sum is σ = 650941812. Its totient is φ = 433961200.

The previous prime is 542451499. The next prime is 542451509. The reversal of 542451505 is 505154245.

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 201384481 + 341067024 = 14191^2 + 18468^2 .

It is not a de Polignac number, because 542451505 - 2²⁹ = 5580593 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (542451509) 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, 54245146 + ... + 54245155.

It is an arithmetic number, because the mean of its divisors is an integer number (162735453).

Almost surely, 2^542451505 is an apocalyptic number.

It is an amenable number.

542451505 is a deficient number, since it is larger than the sum of its proper divisors (108490307).

542451505 is a wasteful number, since it uses less digits than its factorization.

542451505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108490306.

The product of its (nonzero) digits is 20000, while the sum is 31.

The square root of 542451505 is about 23290.5883352053. The cubic root of 542451505 is about 815.5557227067. Note that the first 3 decimals are identical.

The spelling of 542451505 in words is "five hundred forty-two million, four hundred fifty-one thousand, five hundred five".