542806561 has 4 divisors (see below), whose sum is σ = 592152624. Its totient is φ = 493460500.

The previous prime is 542806507. The next prime is 542806577. The reversal of 542806561 is 165608245.

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 a cyclic number.

It is not a de Polignac number, because 542806561 - 2¹⁵ = 542773793 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 542806561.

It is not an unprimeable number, because it can be changed into a prime (542806591) 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, 24673015 + ... + 24673036.

It is an arithmetic number, because the mean of its divisors is an integer number (148038156).

Almost surely, 2^542806561 is an apocalyptic number.

It is an amenable number.

542806561 is a deficient number, since it is larger than the sum of its proper divisors (49346063).

542806561 is a wasteful number, since it uses less digits than its factorization.

542806561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49346062.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 542806561 is about 23298.2093947153. The cubic root of 542806561 is about 815.7336217417.

The spelling of 542806561 in words is "five hundred forty-two million, eight hundred six thousand, five hundred sixty-one".