531456381 has 12 divisors (see below), whose sum is σ = 768357408. Its totient is φ = 353982024.

The previous prime is 531456347. The next prime is 531456421. The reversal of 531456381 is 183654135.

531456381 is a `hidden beast` number, since 5 + 3 + 14 + 5 + 638 + 1 = 666.

It is not a de Polignac number, because 531456381 - 2⁷ = 531456253 is a prime.

It is a super-2 number, since 2×531456381² = 564891769811234322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531456301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16185 + ... + 36398.

It is an arithmetic number, because the mean of its divisors is an integer number (64029784).

Almost surely, 2^531456381 is an apocalyptic number.

It is an amenable number.

531456381 is a deficient number, since it is larger than the sum of its proper divisors (236901027).

531456381 is a wasteful number, since it uses less digits than its factorization.

531456381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53712 (or 53709 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 531456381 is about 23053.3377409867. The cubic root of 531456381 is about 810.0078142822.

The spelling of 531456381 in words is "five hundred thirty-one million, four hundred fifty-six thousand, three hundred eighty-one".