523981881 has 12 divisors (see below), whose sum is σ = 761239908. Its totient is φ = 347301024.

The previous prime is 523981873. The next prime is 523981907. The reversal of 523981881 is 188189325.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 387302400 + 136679481 = 19680^2 + 11691^2 .

It is not a de Polignac number, because 523981881 - 2³ = 523981873 is a prime.

It is a super-2 number, since 2×523981881² = 549114023232596322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (523981811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 166710 + ... + 169823.

It is an arithmetic number, because the mean of its divisors is an integer number (63436659).

Almost surely, 2^523981881 is an apocalyptic number.

It is an amenable number.

523981881 is a deficient number, since it is larger than the sum of its proper divisors (237258027).

523981881 is a wasteful number, since it uses less digits than its factorization.

523981881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336712 (or 336709 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 523981881 is about 22890.6505150028. The cubic root of 523981881 is about 806.1925054368.

The spelling of 523981881 in words is "five hundred twenty-three million, nine hundred eighty-one thousand, eight hundred eighty-one".