531981154368 has 42 divisors (see below), whose sum is σ = 1524827928494. Its totient is φ = 177327051264.

The previous prime is 531981154339. The next prime is 531981154381. The reversal of 531981154368 is 863451189135.

531981154368 is a `hidden beast` number, since 5 + 3 + 1 + 98 + 1 + 1 + 543 + 6 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 529797648384 + 2183505984 = 727872^2 + 46728^2 .

It is a super-3 number, since 3×531981154368³ (a number of 36 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 461788621 + ... + 461789772.

Almost surely, 2^531981154368 is an apocalyptic number.

It is an amenable number.

531981154368 is an abundant number, since it is smaller than the sum of its proper divisors (992846774126).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

531981154368 is a wasteful number, since it uses less digits than its factorization.

531981154368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923578411 (or 923578398 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The spelling of 531981154368 in words is "five hundred thirty-one billion, nine hundred eighty-one million, one hundred fifty-four thousand, three hundred sixty-eight".