542298215281 has 3 divisors (see below), whose sum is σ = 542298951691. Its totient is φ = 542297478872.

The previous prime is 542298215273. The next prime is 542298215353. The reversal of 542298215281 is 182512892245.

It is a happy number.

The square root of 542298215281 is 736409.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 370139608881 + 172158606400 = 608391^2 + 414920^2 .

It is not a de Polignac number, because 542298215281 - 2³ = 542298215273 is a prime.

It is a super-2 number, since 2×542298215281² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (542298215681) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 368205 + ... + 1104613.

Almost surely, 2^542298215281 is an apocalyptic number.

542298215281 is the 736409-th square number.

542298215281 is the 368205-th centered octagonal number.

It is an amenable number.

542298215281 is a deficient number, since it is larger than the sum of its proper divisors (736410).

542298215281 is an frugal number, since it uses more digits than its factorization.

542298215281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472818 (or 736409 counting only the distinct ones).

The product of its digits is 921600, while the sum is 49.

Multiplying 542298215281 by its sum of digits (49), we get a square (26572612548769 = 5154863²).

The spelling of 542298215281 in words is "five hundred forty-two billion, two hundred ninety-eight million, two hundred fifteen thousand, two hundred eighty-one".