531085881 has 4 divisors (see below), whose sum is σ = 708114512. Its totient is φ = 354057252.

The previous prime is 531085871. The next prime is 531085883. The reversal of 531085881 is 188580135.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 531085881 - 2⁶ = 531085817 is a prime.

It is a super-2 number, since 2×531085881² = 564104425995092322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531085883) 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 3 ways as a sum of consecutive naturals, for example, 88514311 + ... + 88514316.

It is an arithmetic number, because the mean of its divisors is an integer number (177028628).

Almost surely, 2^531085881 is an apocalyptic number.

It is an amenable number.

531085881 is a deficient number, since it is larger than the sum of its proper divisors (177028631).

531085881 is a wasteful number, since it uses less digits than its factorization.

531085881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177028630.

The product of its (nonzero) digits is 38400, while the sum is 39.

The square root of 531085881 is about 23045.3006272429. The cubic root of 531085881 is about 809.8195406551.

The spelling of 531085881 in words is "five hundred thirty-one million, eighty-five thousand, eight hundred eighty-one".