531505220042 has 4 divisors (see below), whose sum is σ = 797257830066. Its totient is φ = 265752610020.

The previous prime is 531505219901. The next prime is 531505220063. The reversal of 531505220042 is 240022505135.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 347568023401 + 183937196641 = 589549^2 + 428879^2 .

It is a junction number, because it is equal to n+sod(n) for n = 531505219987 and 531505220014.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132876305009 + ... + 132876305012.

Almost surely, 2^531505220042 is an apocalyptic number.

531505220042 is a deficient number, since it is larger than the sum of its proper divisors (265752610024).

531505220042 is a wasteful number, since it uses less digits than its factorization.

531505220042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265752610023.

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 531505220042 its reverse (240022505135), we get a palindrome (771527725177).

The spelling of 531505220042 in words is "five hundred thirty-one billion, five hundred five million, two hundred twenty thousand, forty-two".