531090386881 has 4 divisors (see below), whose sum is σ = 562330997892. Its totient is φ = 499849775872.

The previous prime is 531090386873. The next prime is 531090386891. The reversal of 531090386881 is 188683090135.

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

It can be written as a sum of positive squares in 2 ways, for example, as 446479212481 + 84611174400 = 668191^2 + 290880^2 .

It is a cyclic number.

It is not a de Polignac number, because 531090386881 - 2³ = 531090386873 is a prime.

It is a super-2 number, since 2×531090386881² (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 (531090386851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15620305480 + ... + 15620305513.

It is an arithmetic number, because the mean of its divisors is an integer number (140582749473).

Almost surely, 2^531090386881 is an apocalyptic number.

It is an amenable number.

531090386881 is a deficient number, since it is larger than the sum of its proper divisors (31240611011).

531090386881 is a wasteful number, since it uses less digits than its factorization.

531090386881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31240611010.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The spelling of 531090386881 in words is "five hundred thirty-one billion, ninety million, three hundred eighty-six thousand, eight hundred eighty-one".