531013535661 has 16 divisors (see below), whose sum is σ = 856761335424. Its totient is φ = 285587111424.

The previous prime is 531013535641. The next prime is 531013535687. The reversal of 531013535661 is 166535310135.

It is not a de Polignac number, because 531013535661 - 2⁶ = 531013535597 is a prime.

It is a super-2 number, since 2×531013535661² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531013535641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 743716080 + ... + 743716793.

It is an arithmetic number, because the mean of its divisors is an integer number (53547583464).

Almost surely, 2^531013535661 is an apocalyptic number.

531013535661 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

531013535661 is a deficient number, since it is larger than the sum of its proper divisors (325747799763).

531013535661 is a wasteful number, since it uses less digits than its factorization.

531013535661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487432900.

The product of its (nonzero) digits is 121500, while the sum is 39.

Adding to 531013535661 its reverse (166535310135), we get a palindrome (697548845796).

The spelling of 531013535661 in words is "five hundred thirty-one billion, thirteen million, five hundred thirty-five thousand, six hundred sixty-one".