542042261 has 6 divisors (see below), whose sum is σ = 550257750. Its totient is φ = 533947656.

The previous prime is 542042239. The next prime is 542042273. The reversal of 542042261 is 162240245.

It can be written as a sum of positive squares in only one way, i.e., 431392900 + 110649361 = 20770^2 + 10519^2 .

It is not a de Polignac number, because 542042261 - 2¹⁰ = 542041237 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 542042261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542041261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55886 + ... + 64863.

It is an arithmetic number, because the mean of its divisors is an integer number (91709625).

Almost surely, 2^542042261 is an apocalyptic number.

It is an amenable number.

542042261 is a deficient number, since it is larger than the sum of its proper divisors (8215489).

542042261 is an equidigital number, since it uses as much as digits as its factorization.

542042261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120883 (or 120816 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 542042261 is about 23281.8010686459. The cubic root of 542042261 is about 815.3505767155.

It can be divided in two parts, 54204 and 2261, that added together give a palindrome (56465).

The spelling of 542042261 in words is "five hundred forty-two million, forty-two thousand, two hundred sixty-one".